http://www.bethblog.com/2012/01/19/news-on-the-creation-kit-and-game-updates/

The Creation Kit and Steam Workshop are nearly ready.

Skyrim’s 1.4 update is currently undergoing testing on all three platforms.

Huge list of updates and extras.

However the part I found interesting is "Our current update plan for the PC is to first release our updates as “beta” versions through Steam. This is something you’ll be able to opt into through Steam and back-out of if needed. This is an extra safety check for everyone going forward and should expedite and improve our updating process for our PC users. We’ll have more info soon on how this will work."