Nope, the Expanded Universe won't be a free update (but it won't cost an arm or a leg either).
I'll pay. I'll pay now, if you want. If it was worth making a new expansion for, it has to be good!

One point... "Expanded Universe" seems a little, er, corny (no offense)... Why not something more evocative, like "Galactic Conquest" or "Terran Revenge" or "Return of the Precursors" or "Terra Ascendant" or "Hotflash Monkey Tenderlovin'?" Obviously, I can't really suggest too much, without knowing the content... it could be that you actually plan to have the galactic map physcially expand during play...

Also: I do hope you aren't quite ready to write out the races eliminated in DA... I rather like the current mix. I assumed they would be absent from GC3. I don't want to have to "dial back" to GC2:DA to use them.