RACING AT SPA
1: BRRT_Angel/GT500 (Definite) [Diamond]
2: nascarfan1400/GT300 (Definite) [Bronze]
3: NinjaEvo/GT300 (Definite) [Diamond]
4: AJHG1000/GT500 (Likely) [Gold]
5: Ettick/GT300 (Definite) [Silver]
6: Dcrimnal/GT500 (Definite) [Gold]
7: trobes29/GT300 (Doubtful) [Gold]
8: JACKOLANTERN31/GT300 (Doubtful) [Gold]
9: PEAGLEZ7/GT300 (Likely) [Silver]
10: Lewismdoc1/GT500 (Likely) [Silver]
11: socalspeedfreak/GT300 (Maybe) [Bronze]
12: @@hsv /GT500 (Likely) [Silver]
13: NearFear/GT500 (Definite) [Diamond]
14: brown352/GT300 (Doubtful) [Silver]
15: TBD/GT500
16: TBD/GT300
UNCONFIRMED
GTP_Bambi/GT300-GT500 [Platinum]
BLANEeyyyx89/GT500 [Silver]
el_rossy_46/GT500 [Gold]
FL_ASSASSINS/GT500 [Silver]
jacksupermac/GT300 [Silver]
NOT RACING AT SPA
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At this moment in time, GT300 is essentially full! The only remaining driver allowed to race in GT300 at this point is GTP_Bambi due to him being a class championship contender. And it is likely that most of those drivers will actually show up. This is Spa we're talking about. Most people like Spa, and with championship battles on the line, most can't afford to miss out on double points.
EDIT #1: Added my own bets on who will actually show up on race day in parentheses.
EDIT #2: Added everyone's current VRR licensure rating in brackets. License meanings and criteria added to the OP.