Notch just dropped a bombshell on Twitter: patch 1.6 will be coming to the Minecraft beta next week. While it's probably taken a little longer than originally planned, it's for a good reason. The patch was primarily a bug-fix update that would include only one new feature: an awesome in-game map system.
Then a few weeks ago Notch updated the timetable for the patch release as "not soon" because he wanted to do something else: add a fully functional Nether to multiplayer.
So we know that maps are coming, as is a working Nether, and there are a lot of bugs squashed to boot. What are you looking forward to most in the patch?