Will Spider-Man be in X-Men: Days of Future Past?

It’s not surprising for superheroes to team up, but with the movie rights for X-Men belonging to Fox and the movie rights to Spider-Man belonging to Sony, it comes as a shock to many to find out that the mid-credits clip for The Amazing Spider-Man 2 is actually an exclusive clip for X-Men: Days of Future Past. Is this hinting at Spider-Man appearing in the upcoming X-Men movie?

The exclusive mid-credits clip shows Mystique, Toad and Havok taking on the military.

There is a large history of Spider-Man teaming up with other Marvel characters in the comics and he has appeared with the X-Men many times.