Currently confirmed in LMH: Toyota, Glickenhaus, Peugeot, Ferrari, Kolles
Currently confirmed in LMDh: Porsche, Audi, Acura
Not yet officially confirmed but as good as certain in LMDh: Lamborghini, Cadillac
Will do either LMH or LMDh: Alpine
Rumoured to be considering LMDh: BMW, Bentley, McLaren
BMW may also re-join the GT-Pro class (I hope we'll see Aston Martin there again as well, not counting on them doing LMH now that it's in Stroll's hands)
When the Valkyrie project fell through I really thought we were in for a long doldrum in prototype racing. Boy was I wrong. I sincerely hope the world avoids any sort of economic crisis, as those tend to be the things that bring an early end to boon times in sportscar racing. When customers don't want to play and manufacturer budgets tighten, racing programs get dropped.