User blog:Timeoin/Skyrim Creation Kit and other updates

Bethesda have updated that they wont be releasing the Construction Kit until sometime in January. However, it is going to be integrated somehow with Steam Workshop, and this may be the reason for the delay. I'll keep you posted as more information about this comes to light.

Sources: http://forums.bethsoft.com/index.php?/topic/1300562-skyrim-what-were-working-on/ (Posted by Bethesda themselves).