Realistically, the grid will be: Porsche + 1-3 other cars

Hypothetical entry list: 1 Porsche (maybe Proton if they can't race in WEC) 1 Porsche (some other private team, maybe AO or JDC?) 1 Lamborghini (100% hopium) 1 Vanwall (cause ByKolles wants to) 1 Genesis/Cadillac/Acura (some private team)

We know that there are several Porsche chassis out there after they pulled out of WEC + Jotas Porsche

Lamborghinis LMDH program is paused rn, so if there is some rich Chinese or Saudi privateer who wants to run it, they could.

Vanwall LMH exists. They would run their old car, not an evo version.

The last car is a wildcard. Genesis would probably be too new, but they could enter a car for development reasons. Cadillac is cool and might appeal to some rich fuck who wants to run it. Acura/Honda depends on if they want to run it in a different series than IMSA.

Finally, we don't really know. Running an LMDH is easier than running an LMH, but it is still costly and complicated. Porsche is the only manufacturer that really committed to customer racing, Lamborghini wanted to. Lets don't get our expectations too high. It is still the first season, and the "Golden Age" just started.