Much of the fanfare surrounding Fallout 3 has died away and now Bethesda has begun work on fixing flaws discovered since launch. Following up from the initial patch for the PC version, Bethesda has mentioned that they are preparing a cross-platform set of patches, looking to update the game on the PC, Xbox 360 and the PlayStation 3. With no set release date on the actual patch or a list of fixes planned, we can only speculate on what Bethesda intends to do.
Most likely they'll continue to focus on bug fixing, as even after the initial PC patch there were complaints of frequent crashing on the official forums. Issues with crashing were much less prevalent on the consoles, so it's a bit of a mystery as to what they plan on doing there. It's also strange that they'd announce a patch coming for all three platforms at once - unless they have a laundry list of very game-specific issues to deal with.
Hopefully Bethesda will learn their lesson from the post-launch reception to Morrowind and Oblivion, and make the decision to release a SDK or some form of development tools for the game to let modders and the game community step in.