Who's the newest member of the Fantastic Four?

In the wake of the death of Johnny Storm, the Fantastic Four are getting both a new member and a name change. Today Marvel announced that Spider-Man would be joining the ranks of Reed Richards, Sue Storm, and Ben Grimm, starting in FF #1, which comes out March 23 with the creative team of Jonathan Hickman (script) and Steve Epting (pencils):

After the death of the Human Torch, the surviving members of the Fantastic Four-Mr. Fantastic, Invisible Woman & Thing-join with Spider-Man and some top secret members to form an unstoppable force: The Future Foundation. Their mission is simple: save the Marvel Universe from its greatest threats and prevent future dangers from arising. But even with knowledge of what's to come and one of the most powerful teams ever assembled, just what villainous force could stand in their way?

You may remember that Spider-Man attempted to join the team in the very first issue of Amazing Spider-Man but turned it down because they didn't pay. In the 1990s, Spider-Man was an interim member of the team along with Wolverine, Hulk, and Ghost Rider, but this configuration of the team lasted only a couple of issues.