I got the core worlds expansion for Christmas as well, it looks really good, adds a lot but not too much complication to the game.
I am eager to try it. Though I have not gotten to play Core Worlds as regularly as I would have liked, I'd like to see what they did.
On another note, I keep checking but have not seen an expansion for Eminent Domain. There were rumors of an expansion and it needs one.
Also the new Race for the Galaxy Artifacts is not out yet. I keep checking. I think part of the hold up might be that they need to reprint the base set since those are out of stock, before releasing Artifiacts. So it is really a double manufacturing run to release the new arc.
--Chuck