Potion Stack Size

Potions, Splash Potions and Lingering Potions can now be stacked to 16.

Big Potion

The Big Potion is a new type of potion that takes twice as long to
drink and gives double the duration of its effect. It cannot be stacked.

Small Potion

The Small Potion is a new type of potion that takes half as long to
drink and gives 3/4 the duration of its effect. The container shatters
when consumed, meaning it won't be added to your inventory. It can be
stacked to 16.

Milk Chalice

The Milk Chalice gives the same effect as a milk bucket when drank from. It can be stacked to 16.
Its container can be found in village houses and can be filled by right-clicking a cow.

Pedestal (1.1)

The Pedestal is a decorative block with functionality similar to that
of an item frame. It can hold 1 item, which it displays as if it were
dropped above the pedestal.

Mundane Potion Functionality (1.2)

Mundane Potions now act like Awkward Potions, except that they can't
be upgraded with Glowstone or Redstone. Great for early game, but the
short duration makes them obsolete later in the game.

Thick Potion Functionality (1.2)

Thick Potions also act like Awkward Potions and can't be upgraded
with Glowstone or Redstone, but once brewed can be mixed by using other
potion ingredients to result in a potion with 2 effects.