There's a dessicated corpse, at the very least, but we don't know for sure what that means. Presumably, the DNA of the body matches up to Bruce's.
He was hit by an Omega sanction, and it hasn't been revealed what precisely that means, but it appears that he's undergoing a series of non-chronological reincarnations, each of which becomes progressively more dire.
So... Physically, he's dead, but his spirit is still floating around, being reborn again and again. In the process, he's scrawling the symbols of the present day's current heroes, seeding them throughout history as the world's new pantheon.