I haven't got to play much, but here's what I've seen.

-Doors seem to work a lot better. Still weird to destroy.
-Switches/pressure plates/redstone work.
-When you light animals on fire, the fire looks cooler.


Unfortunately, I am seeing a bunch of new glitches.
-You get stuck at the top of the map.
-Weird things happen with you fall from high places.
-Server resources are way higher with much more error messages.
-Random freezing/crashing.

:-/