Uses CGI stand-ins from JP1 and the D-rex CGI isn't finished, but the Mosasaur one is! http://iconosquare.com/kenbarbforever
Photo of the Mosasaur:
UPDATE: Leaked clips have been removed.
UPDATE 2: I've just been sent some pictures from a FOURTH leaked video! One with an overturned gyrosphere, and 2 others involving Pteranodons attacking a helicopter. Seems like we're getting the Ptero Attack from the scrapped finale of TLW!