Well, since I haven't seen a full thread and the usual sites I've hit up don't have too many GG SDCC pics, here's what I've found scouring the net (okay, google).
I'll try to cite what I can. Gentle Giant being what they are, I have no idea what the scale is (they had a Venom 1/4 scale displayed at a Con before that became a 1/8) or even if they'll mass produce to sell but I'll put what the display scale is if I know :P
From IGN
Rey and BB-8 (1/6 scale displayed)
First Order Executioner Trooper (1/6 scale displayed)
Praetorian Guard (1/6 displayed)
Star Trek Discovery Burnham vs Klingon (1/4 displayed, see note above)
Honey Trap (1/4 displayed)
Star Wars Porg Bookends
Star Wars Show (Chopper and other droids)
Black Panther (1/8 scale)
Gwenpool