More spoilers...
You saw missiles heading to his location and him literally getting engulfed in the explosion. He died instantly in an act of self-sacrifice (because also, if you remember, he didn't want to escape because he'd never be able to be with his love and child without killing them). If it's the same Bond "with one bound he was free"-ing outta there it utterly undermines that film.
On the other hand, as I argued before, "James Bond" is a moniker that anybody could claim. It's clear that Craig's Bond is not literally the same character as Brosnan's, Connery's or Moore's, not least because the earlier ones were in their 30s or 40s during the Cold War, and the more recent Bond films have been set in, at the very least, the early 21st Century. So it follows that "James Bond will return" is a reference to a new iteration of the character, rather than the same one.