Here's the announcement by the author:
"Stunt Car Racer TNT (The New Tracks) will be released around christmas.
Eight new tracks:
DIZZY DESCENT, WITTY WAY, CRAZY CAPER, AMAZING ADEPT, JERKILY JUMP, EVILLY EPISODE, TEASING TEMPER and RAT RACE
Track parameters changed:
start positions, start height, damage sensitivity, boost count
AI speed adjusted/changed for all tracks
Some visual adjustments
e.g. race colours, track names gfx dropped, title screen modified etc.
a beta version is already available: http://www.discreetfx.com/care/
It runs on real Amigas and in UAE.