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FOR THOSE LOOKING TO GET YOUR ASSES SPOILED
THIS is a frequently updated collection of most spoilers and a lot of informed speculation, combined with imagery from the marketing.
THIS is essentially an audiobook reading of a summary of the above (from May).
Between those two, you'll basically have a pretty good idea of about 90% of the plot of this film.
A script never leaked, so things like characterization, character motivation, dialog, and tone aren't going to be very present. But you'll definitely get an idea of who does what, and where they go, from either of the above two links.
There's plenty to read at the link but I'll just quote these parts:
Again, much more to read surrounding these rumors and how they might play out, but didn't want to quote everything.
Here’s the gist: The bad guys in Star Wars: Episode VII are being called “Jedi Hunters” by people working on and around the film. These are scary individuals, dressed in black, some helmeted, that hunt Jedi for the Empire.
Supposedly the “Jedi Hunters” or Inquisitors (from the sound of things) are the reason there is no New Republic after Return of the Jedi. That’s right, they’re saying there is no New Republic. Source #2 claims to have been on set for a sequence in which we learn the Jedi Hunters worship the Sith and want to resurrect them. Their mandate was to protect the Sith at all costs and insure their survival.
This source also believes Luke Skywalker has been fighting to stop this for the last thirty years of his life, but he is outnumbered, tired, and in need of help.