The Yuezhi are removed, instead EB is implementing another steppe faction, the Saka Rauka (sp)
The senate slot is being used for another faction, this wasn't possible earlier. I don't think the new faction has been revealed yet, but I could be wrong.
There will be no Iberian faction in 0.8, instead a single Iberian tribe called the Lusotannan.

That's how I understand it, anyway.