I would like to see for Bedrock (PS4):
Better rendering distance.
Slabs and stairs in the same colour as already available (concrete) blocks. For creating more building possibilities.
The possibility to go higher then 256 blocks.
As a giant skyscraper does now still look like a 'normal' building.
It's not high enough.
Even my airport traffic control tower will be reaching half of the 256 blocks! As my Airbus A380 isn't small, the terminal is about 90 blocks high, the control tower should become about 160 / 170 blocks high.