Marvel Comics Legacy Spoilers follow.
The variant covers to Marvel Legacy #1 by Art Adams seems to indicate that the Phoenix Force – from Avengers 1,000,000 BC – and perhaps an older Jean Grey will return from the dead with…
…the Young Man Logan Wolverine?
Nightcrawler has been dead and is, I believe, still alive in Marvel Comics currently.
Marvel Legacy #1 hits stands at the end of September 2017.