The Amazing Spider-Man writer reiterated Marvel Comics' promise not to relaunch its line following Avenger Vs. X-Men.
"With Marvel NOW! everything that happened yesterday and the year before STILL happened," he wrote on Twitter. "All of those comics still 'count'. The Marvel NOW! initiative is about what happens next.
"What you're getting with Marvel NOW! is Marvel's most high-profile creators kicking off new, epic runs on Marvel's biggest characters."
He continued: "This isn't a fly-by-night deal. You're not going to see a creator on a book for four or six issues and then - whoosh - a new creative team gets slapped in.
"What you're getting here is a bunch of writers and artists who are committed not just to exploding out of the gate with big, bold new ideas - but to also make those the starts of legendary runs.
"That's Marvel NOW!"
Marvel has previously denied rumours that it would relaunch its line in a similar move to DC Comics' successful New 52 initiative last year.