Scorcher

The Scorcher has been seen in official screenshots. It also appeared in GTA V.

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

More bicycles and scooters

BMX
Seen in the Extended Look. Earlier in GTA San Andreas, GTA Vice City Stories and GTA V.
Boomazoom
New to the series
Seen in official screenshots.
Cruiser
Seen in official screenshots. Earlier in GTA Chinatown Wars and GTA V.
Del Perro electric bike
New to the series
Seen in the Extended Look.
Endurex Race Bike
Seen in the Extended Look. Earlier in GTA V.
ZOOT electric scooter
New to the series
Seen in the Extended Look.
LomBike
New to the series
Seen in official screenshots.