We're looking at what, nearly 20 cars in GTD?
Not quite there yet, but there's a few teams that have yet to confirm plans.
Confirmed/Highly Likely:
AIM Vasser Sullivan (2 Lexus' full season)
Compass (1 McLaren for Sprint Races)
Grasser (1 Lamborghini for Endurance races)
Herberth (1 Porsche for Daytona)
Magnus (1 Lamborghini full season)
Meyer-Shank (2 Acura's full season)
Pfaff (1 Porsche for Sprint Races)
Riley (1 Mercedes full season)
Scuderia Corsa (1 Full season, possibly a second for the NAEC races like in 2018)
Starworks (1 Audi full season)
Wright (1 Porsche full season)
Total: 9 full season, 11 for the Sprint Cup and 10 for the NAEC.
Unknown's:
3GT - Stated they wanted to continue, but nothing has been announced (and I doubt there will be)
Flying Lizard - Lots of rumors about them and McLaren, nothing announced yet.
CJ Wilson/Gradient Racing - Gradient formed by former CJ Wilson employees, no word on plans for either team yet.
HART - Status unknown
Land - Ran a few races in 2018, I doubt they return though given their issues.
Paul Miller - Announced a switch to BGT America, but with Snow gone that may change.
Park Place - Recently moved to a new shop, no word on a GT3 program yet though.
Turner - They always seem to be a question mark at this time of the year, hopefully they wind up doing a full season again.