Hard to say. It tests up to 50% scale, so F1 is out of the question, not unless they reduce their 60% testing rule down to 50% testing, although I could be wrong. They may have done so already. Who knows.

Indycar teams could still test there, although Dallara as a manufacturer uses the Arc facility for their testing in the US. Maybe F2, F3, BTTC etc?