Nethaera posted in the beta forums that the NDA for the Wrath of the Lich King Alpha has been lifted. In response to a question asking if people could share things from the Alpha, Neth says "Feel free to discuss at will." This is great news for everyone that wants to talk about the alpha material legally. Those who've been part of the Alpha will get to post troves of information and stories that they've collected. I'm sure some of them will be going up on WoW Insider soon enough, and these will only expand as beta invites become more active.
The Alpha NDA was a source of tension for a lot of people, especially those in the Alpha. Several set up or contributed to sites like DeathKnight.info and WotlkWiki.com. It was very difficult, if not impossible, for Blizzard to enforce the NDA. However they were successful in forcing WotLKWiki.com to relocate.
It will be interesting to see what the repercussions of the lifted NDA end up to be. One thing is for sure though, and that's that we're starting to see new and exciting information about WotLK come out minute by minute. Stay tuned!