[Snowflakian]

This movie is supposed to be Loki and potentially the skrulls, but it is some kind of invading massive space-faring force.

Next movie may expand out to other cosmic concepts like thanos, though I do hope eventually for ultron. I hope they explore some of the bigger 'earthbound' massive threats.

We may see a few low level threats taken out by individual team members as they are deciding on whether to join the team, or right before recruitment, but I wouldn't count on many low level threats. That's something for their individual movies. The avengers movies are for the massive threats that you need all of them to contend with. Stuff like Loki and his suggested army of changeling mischief makers or whatever threats he brings with him, Ultron and his hordes of robotic threats and unbeatable nature, Kang and his time traveling nature, among any others of a larger less direct to any one hero nature. Avengers is supposed to be something of a massive scale, so opponents of similiar nature seem about right, including the Kree, Skrulls, Thanos, and more.

This might explain the push for a Guardians of the Galaxy film too. It'd allow a direct connection or build up into Thanos and them in the avengers movie, as well as beta ray bill in Thor, or granted access to asgard to become like thor. (GotG will rock as much as MiB did!)

Lots of potential, but I do have one question. Didn't disney buy back the distro rights from paramount? What'd Paramount offer? Why is their name still attached to this film? Did marvel want another scapegoat on the off chance this does poorly? (Like they pulled with Punisher Warzone.)