I'm so looking forward to Guardians of the Galaxy. I've been rewatching most of the marvel cinematic universe lately as my girlfriend's seen none of it (sacrilege, I know). It's been good as I know these films pretty well so I can chill and wait for the fights while picking out the little references and such that I sometimes miss. Don't ask for an example, "Mary Jane" has diminished my memory for such things.
Next up is Thor: The Dark World. This gets me thinking, will we have mention/see any of the Asgardians? I hope so, I think that would actually make the Asgardians less mythical, as they feel in the other films, and more cosmic. Along with all the new races/planets/factions we're going to get. I'm also looking forward to some space city parts as, all their mistakes aside, this was something the prequel trilogy did well but I can't think of others since. The Collector seems to be city based to at least part of the film.
Thanos will be cool too. I remember reading a business article from inside Marvel studios where a snippet of a conversation was quoted regarding Thanos' throne and how it'll been propelled by energy disks as opposed to rockets. It sounded like they were giving everything serious thought.