Bethesda recently released the 1.2 update for Skyrim which was intended to fix a host of issues that people were having with the RPG across all three platforms. Turns out that there are still some PS3 owners experiencing issues. (Glad I put the Xbox 360 version on my Christmas list, then!) Bethesda has reached out to users to collect save games to see if they can determine exactly what the problem is. They're currently in final testing on the 1.3 update, but the long-term play PS3 issue is not going to be part of that fix.
The incremental updates are going to continue after the holidays following the release of 1.3, because with a massive open-world game like this, it's impossible to play test it sufficiently for everyone. So hopefully they can keep everyone's gameplay experience as smooth as possible.
Bethesda is also going to release a free Creation Kit for the PC in January that features the same development tools they used to create Skyrim. And they're going to integrate Steam Workshop into the Creation Kit, although you can also share and access mods on various other fan sites.
Skyrim What We're Working On [Bethesda Blog]