Obey
The Tailgater is an Obey sedan returning from earlier GTA games.
Image: Rockstar Games'55 Stanier
First shown: Rockstar media: Vintage Vice City Pack
Asterope GZ
First shown: Official Screenshot: Grassrivers 02
Emperor
First shown: Trailer 2 + various Official Screenshots
Intruder
First shown: Trailer 1 (0:46, 1:03 and 1:07)