Re: MCU: The Marvel Cinematic Universe Official Discussion
My guess at this point is that Marvel is looking to build up its "Cosmic MCU" starting with Guardians of the Galaxy. It's the same universe, but it is kind of its own separate thing from the Earth-based heroes and Avengers stuff, thus a different "brand".
And the culmination of Phase 3 may be (as most speculate) involving Thanos, Avengers, and their Cosmic stuff (Guardians, Inhumans, Nova, Captain Marvel, etc..). S maybe that is what he is referring to.
I think that is more likely than hinting at bringing Spider-Man or X-Men into the fold.