ewoks could still be a surprise, we don't see jabba in ANH for example (well we SHOULDN'T see jabba in ANH)

re-using yavin would be a retread, but what if it had changed since ANH?

there will be the corpse of the death star floating in orbit, with chunks of it floating around like asteroids.

much of the former rebel base could be burnt out and scorched, assuming the empire had attacked it later on. new footage of rebel soldiers could mention how brutal the following imperial attack was, suggesting that they might expect a similar treatment should they fail.