Dark Eldar Vehicle Upgrades
For those of you wondering if Dark Eldar are to get vehicle upgrades, one of my sources indicates that the answer to this is a simple "yes". All Dark Eldar players may want to cross their fingers in hope that this point.
Tyranid Release
There have been a number of rumours about the release date for the Tyranids in the past. However, the latest date I've heard (from an, as usual, annonymous source) is February next year. Who knows, we'll see, although Tyranid models have been spotted "in green" (the putty the sculptors use to make miniatures with) so it's quite possible they will indeed be out in February.
Sister Release Date
I recently heard that the Sisters of Battle Codex is reasonably complete at this time. It is currently awaiting plastics which may apparently take around two years though due to the greater focus on the new Warhammer due to its imminent release. Of course, neccessary testing of the Codex is likely to figure in things too.