So, Kevin Feige was asked if there would be a crossover between the two properties. He essentially said not likely. I would tend to agree. While it would be REALLY COOL!! and massive, it's not necessary. The creatives would have to think of a good way to justify the crossover. I mean, if it happens, great. If not, that's fine too. The only characters/group that I could see crossover with SW that makes any kind of sense would be the Guardians of the Galaxy.