As far as the phoenix lords go, they are rumored to provide a table wide buff to their aspect units while on the board. For instance Karandras is rumored to grant +1A or +1S to Scorpions.
I've been debating whether to post this or not, but I may as well. This is what I've heard is coming in terms of kits:
New Avatar sculpt
New Falcon variants
Entirely new vehicle
New character sculpts, new special character(s) and new SC sculpts
New versions of Aspect warriors, similar to current models but 'more dynamic'