So they say in the sticky:
"The team is working to get it released as quickly as possible. As soon as we have more information to share, we'll let you know."
Call me a glass-is-half-empty person, but I read this as "We'll release the kit about one month past the release date of our first DLC for the PC, which of course will mean two months past when that same DLC appears for the XBox"
The delay is just a play to garner more sales for their DLC.
Relax guy. They do this every time. They say they may release one, or the will, and two weeks or so after launch they release it. Fact is, most of them are probably focused on bugs right now. I'd rather many other people actually be able to play their game, rather than us be able to mod ours. Not that it maters, we'll all gt there eventually.
As for why it's taking so long. No idea. They didn't tell us. Maybe they have to strip out anything from it that isn't their property. Maybe they need to make a build that removes all the console stuff so people playing on 360 and PS3 don't mod their game (as that would get Microsoft and Sony mad at Bethesda). Who knows. Bethesda is an extremely secretive company, most are, but they also tend to be rather fascist about framing the discussion, about controlling who says what about their games. Up until this Mojang bull they pulled, it was one of my biggest issue with this company, second only to their lack of artistic integrity.