I spoke with Thom about Empires, and last I heard it was still on the list to be made, but it wouldn't be for some time. Now whether that has changed or not, I don't know.
I do hope Empire does finally see the light of day. I was royally pumped when the articles starting coming out, especially since the original boxed set was to have been Blackbloods and Devout. With large Blackblood Myrmadons, Howdahs, and ranks of Trolls....Devout War Barges...and more Soulflayers than you can shake a stick at....
If a playtest/design group ever opens up for Empires...sign me up!