One more thing to add...do we think the guardians of the galaxy will end up crossing paths with the avengers for the infinity wars? I don't know much about the comics...
That would be my guess.
This whole Cinematic Universe has been building on the Infinity Gauntlet storyline with Thanos being the big bad guy trying to collect all 6 infinity gems to complete the gauntlet. The gems in the movies have been the Tesseract (Space Gem), the Aether (Reality Gem), and the Orb (Power Gem) from GotG. I also think Loki's staff is the Mind Gem but I don't know if that's confirmed. If so, then it only leaves the Time Gem and the Soul Gem left to introduce.
Basically, if one collects all the gems and puts them in the gauntlet, they control the entire universe. Thanos wants that and if he gets it, it'll be all hands on deck in the MCU, which will mean a probable crossover between GotG and Avengers since everyone will be needed to stop Thanos.
Gosh, Part 2 is gonna be epic.