Jag are are looking at a return as well. Freed from the shackles of Ford Tata want to rebuild the brand, Apex are already running a GT3 car.
Mercedes are also looking at a GT2 car.
The Dome was fully crewed by Toyota drivers, so something should be coming soon from there, Dome Toyota.
Nissan could come back, I would think Oreca would be the obvious partner.
Audi have said they wont be back with the R10 I think Eurosport said, so its either a new P1 or a step down to GT. As Ulrich talked about a battle with Pug and Honda next year I dont see them stepping down to GT
And best of all Aston - prodrive and Vette engines should be availble to customers in P1 and who knows, maybe a full works team as well.