Version 1.1 is out and the most exciting changes are:
- Enchantments for Bows - there are 4. Power: deals extra damage, Punch: knocks mobs back, Infinity: As long as there is at least one arrow, keep shooting and you won't run out, Flame: sets mobs on fire.
- Sheep eat grass to regrow wool, however the wool return when sheering is now 1 to 3 wool instead of 2 to 4.
- You can walk on farmland without trampling it. Only jumping on it tramples it.
Warning: Some users reported crashing in loading screen.
Also, connecting to a server with lower version could be a bug. It happened before in one of the weekly snapshots.
I recommend you wait with updates until a full bug list emerges...
I remember that transition from 1.8.1 to 1.0 made my existing world all snow. Every chunk except the border ones that were created turned to snow and ice.