Rumor suggests Skaven, Lizardmen and/or Vampire Lords as new possible races. Certainly the fist for sure (existing models in game and what not look pretty good, would just need to small touches to make player usable really).
As for the rest of the rather lengthy post by MJB, as I said above it certainly makes me happy. The KotBS should draw more to Order, making realm balance a little more even (although to be fair it is not too bad on Karak Hirn, may 2.5:1 or so
), and if the RVR changes are all I hope they are, then RVR should finally start drawing HUGE crowds - kind of like last monday, but every damn night!