I want a cave update, but probably a combat (2 combat related block have been held back to the next major themed update), however the best idea for 1.15 is probably a performance update XD

although i agree there needs a cave update there definitely needs an optimization update too
though it would make sense if that happened after a cave update (or atleast to me)

Cave update! *Toycat intensifies*

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Caves and nether need massive reworks considering that everything that's overworld or end related has gotten changes that have massively overhauled a purpose or reason for its respective area. (You have more reasont o go to the end than to slay the enderdragon, because of elytra, shulker boxes, and if you're the building kind of person the update brought endstone bricks and purpur, and more grand, End rods. The ocean's huge update in Update Aquatic is another one, and more recently, Villages got an overhaul, and jungles got more to them.) The nether's gotten, way back, quartz, and more recently, magma. But neither are feature redefining, and the Nether seems rather bleak in terms of why you'd go there.
And caves, of course, because they're a big part of what the game is sold as. Its about time caves got some love.
Overall, after that, optimization would be nice. I understand that can get frustrating at moments however due to how the game is coded, and an update like that would probably end up being to itself. But that'd be worthwhile in my book, since that was a huge grab for me way back when. I could run it on a little notebook without many complications other than screen was way smaller than I would've preferred.
Now I can't be so sure about that, but it made the game truly stick with me over the years.

As a tired, overworked resource pack maker, I'd say just give us a performance issue fixing overhaul. I don't need any more stuff to re-texture. 1.13 had already screwed me over with it's "Flattening" nonsense, and 1.14... I think we already have enough "Squidwards," thank you very much.

Though, I think the addition of sharks would be neat! :3

Caves. Caves. Caves. Caves. Caves. Caves. Caves. Caves.

ALL DA BIOMES

WE DON'T NEED ANY MORE UPDATES
Minecraft has turned into modded Minecraft. Let's go back to the good old days before all the updates.

I would rather just a performance update. It's hard running a good Minecraft server on 1.14 because of performance issues, bugs, and all the new stuff. I'd rather Mojang slow it down and fine-tune Minecraft before adding more stuff. But, if they're going to add more stuff, I'd like to see a cave update or new biomes. The beach biome with palm trees sounds like a great idea.

B E E S

Among those who would prefer The Silient Update: ie one devoted to fixing the longstanding bugs and restoring performance.
(More than enough meat onn those bones to keep them busy for some time.)

If MS/Mj can't bring themselves not to fiddle with mechanics:
fixing the worst additions; notably mid-water & mid-air spawning (drowned & Mob B, respectively)
calving off the pillager raid minigame (preferably into an official mod, but at least into a gamerule toggleable 'thing')
restoring the original size of the spawn chunks (or fixed @ 17x17)
would offer sufficient material.


Aside from the above listed (& badly needed) fixes, leaving game mechanics alone [once the mechanics for 1.14 have actually been finalized – such are currently changing in each new snapshot] for long enough that the new material can be fully assimilated would be salutary.
As example:
1.13 added drowned (including the pernicious midwater spawning) causing security issues for ocean bases, BUT
1.13 also added mid-air spawning for MobB making open air anything inadvisable, BUT
1.14.? removed the need for village sky-view allowing underground villages, BUT
1.14.? also added pillager raids (and patrols) which now seem able to spawn underground and in any biome, BUT
1.14.? allowed cats to act as a defense against MobB [maybe, insufficient testing in actual play], BUT
1.14.? changed Iron golem spawning [again] to be dependant on villager panic, BUT
1.14.? also made villager panic unsustainable, BUT
1.14.? allows raids and/or patrols to spawn at locations that appear to be within villages, BUT
1.14.? [some versions] incorporates raid waves that can last multiple MC days, ETC

In light of the above, how does one accomplish something as simple as building a village that can be safely both left alone and visited?
No answer will be possible until some time after all the relevant game mechanics have been stabilized.

…and this is just building a simple village, nothing said about villager breeding, iron farming, or trading beyond what may incidently occur.

Vanilla MC is intended to be a sandbox where players (alone or with friends) build a world – this takes a substantial investment of player time.
Investing that time, however, makes no sense if the underlying mechanics (the physics of the world as it were) are continuously changing. There is much to be said for a degree of stability.

Cave update for sure.

Mining was and still is a key game mechanic and is basically a requirement to beat the game(beat the ender dragon(and yes I know it's possible to beat the dragon without any mining)). But over the years it's not changed at all. Now as for what I would like see changed, here's a few things:
-more ores
-mobs that only spawn under ground(cave zombies that give blindness perhaps?)
-ore(s) in the end. I mean seriously the nether has one why not the end?
-more under ground structures(dungeons are a must, but I think it would be cool to have a WORKING mine shaft full of villager miners)
-more diverse cave structures, I am tired of exploring the same tunnels again and again
-and maybe an under ground version of the wandering trader if they want to go the extra mile

Now, because of all this new stuff (improved villages, new mobs, underwater stuff, etc.) mining is pretty pointless. Caves are a key part of mining.

Caves and Nether. Perhaps have caves generate differently depending on the biome; so in a jungle have vines and roots in the caves, and in general, have different sizes/shapes/tunnel variety for caves. Perhaps introduce tombs. Underwater caves could have a slightly higher ore spawn rate, that way there's a point to going to one. Maybe another ore that is entirely exclusive to caves?

Nether is bland, maybe introduce different areas/biomes in the Nether, update how terrain generates, and another mob and/or potion. Basically spice it up, and have more reasons to go there.

Also combat could either be polished up, or tinkered with.

I've heard that 1.15 isn't going to be a cave update, but it'll add functionality to things like fletcher's table

give everyone capes. I didn't go to minecon or download the cape mod BUT I can still see capes

it is combat update v2.