Penumbra

The Penumbra has been seen in the first trailer. It also appeared in GTA V.

Rockstar has not shared more about the Penumbra yet. This page grows as new trailers and screenshots come out.

More compacts and hatchbacks

Cypher
Seen in the Extended Look. Earlier in GTA Online.
Sugoi
Seen in official screenshots. Earlier in GTA Online.
Blista Compact
Seen in the Extended Look. Earlier in games including GTA IV, GTA Chinatown Wars and GTA V.
Declasse compact car
New to the series
Seen in the Extended Look.
Futo
Seen in the first trailer. Earlier in GTA IV and GTA V.
Penumbra FF
Earlier in GTA Online.
Tailgater S
Seen in the Extended Look. Earlier in GTA Online.