Sony and Fox teaming up to bring Spider-Man into the X-Men?

Is this a sign of big things to come? We all know that sitting through all of the credits of Marvel films always leaves us with a huge tease of future Marvel movies, but this is somewhat odd.

It seems that after The Amazing Spider-Man 2 credits have finished rolling, we will then be treated to a post credits sequence leading into, X-Men: Days of Futures Past. What's so odd about this is that Spider-Man is a Sony film, all rights to him are owned by them. And X-Men is a Fox property. Why would rival studios be promoting each others films if a crossover isn't in the cards for the future? It could mean big business for both studios if they have decided to play nice together and do this. Seeing Spider-Man, the Fantastic Four, and X-Men all together in one movie would be huge. Now if only Sony and Fox would be nice and team up with Disney to bring the Avengers into the fold, wow.

So what are your thoughts on this? Do you think we can expect to see Spider-Man pop up in X-Men: Apocalypse?