So what new tracks have been built in FL in the past few years?
There's the Gainesville Test Track, built by Gainesville Raceway...host of one of the biggest professional drag events in the nation (so it seems, I don't follow the sport)

Primus test track (kinda)...built by a formula car racing development company who is also the sole(?) importer of van diemen chassis.

More additions to the list?
Primus gets a kinda because it still isn't fully open...they are currently having trouble with nearby residents and the county I hear