The creation kit has now been released and can be found on Steam.
When we created Skyrim, we set out to make the largest, most engrossing role-playing game we had ever attempted. Now it’s about to get a whole lot bigger, thanks to our amazing modding community.
Mod-makers have a long history with Bethesda Game Studios, bringing to life new quests, locations and characters, as well as making changes to game from subtle tweaks to full-blown overhauls. With the Creation Kit, the same tool we used to create Skyrim, there’s almost no limit to what can be accomplished – and we’re putting that power in your hands.
Best of all, access to the Skyrim Workshop and Creation Kit is free for anybody with a Steam account and a copy of Skyrim.
With the Skyrim Workshop, finding and installing your favorite mods is easier than ever before. Mod-makers will also enjoy a streamlined process for uploading mods directly to Steam.
Here is a link to the steam workship for Skyrim.
Source: Creation Kit Wiki