From Thom in the thread regarding the Heresy order:
"Jason (et. al).
Nearly all their models will be statted up for use in the games. I will try and sit down tonight and post up the unit sizes so you can at least know who is an individual and/ or what size a warband may be. Some of the stats will be posted on these boards in advance of the new site.
Cheers!"
I think the "new site" is indicative of forward progress. Keep in mind that Thom is now having to move house because the owners of the place he is renting decided to sell and give him the opportunity to buy or move elsewhere. He's been busy house hunting and let's just say writing code.....
That's all I can say about that.
As for units for the game engine, you'll be seeing those on these forums too. Right now we're working on mostly Fantasy stats for the Heresy line, but sci-fi will be appearing too. See the "New Evil Models Coming" thread in the Chronopia section. Also check out the "Time to Rally" thread in the announcements.
Thom will make an official announcement answering your question regarding the unreleased sourcebooks, and whatever else he's cooking up.
Stay tuned and enjoy your gaming.