Notch has posted the 1.6 change list and bug fix list for the upcoming 1.6 patch. The updates biggest feature is the use of maps, something that will surely enhance the play experience. Craftable maps will be available and the Nether will be accessible in multiplayer.
The change list is rather long, so you can view it here if you wish:
Notch on Tumblr
The change list is rather long, so you can view it here if you wish:
Notch on Tumblr