Blizzard has released a timeline of sorts for upcoming Diablo III updates, detailing the kinds of things that are due to be fixed and the kind of things that due to be tweaked.
The first update, 1.02, will mainly be patching up the various network issues that have affected the game since launch. It should be out within the week.
Looking further, though, some of the things on the menu include tweaks to the difficulty on Inferno and making some stats on Legendary items more transparent so people stop bitching that they're not as powerful as they thought they'd be (Blizzard says they're not necessarily meant to be the best).
For a more detailed rundown of what's in store, check out the full post below.
Game Design Update [Blizzard]