According to JoBlo's sources the main villain in Guardians Of The Galaxy will not be Thanos, nor will it be the recently rumored Collector (Controller?), but Ronan the Accuser, the ruler of the Kree! This character has not only battled the GOTG in the comics but also the likes of The Fantastic Four, and The Inhumans -- so this could well be a way for Marvel to expand and tie into other cosmic themed movies later down the line. We know that actor Lee Pace was recently cast as the main villain in James Gunn's movie, so although JoBlo can't confirm as much, it'd be a safe bet that if this is accurate he'll be playing Ronan. Will this eventually build to the Kree/Skrull war? Only time will tell.
As for the Spidey news, well this isn't as big and probably something most of us assumed anyway, but they can seemingly confirm that Paul Giamatti won't just be playing Aleksei Sytsevich as we have seen so far in the set pics, but will over the course of the move transform into some version of The Rhino. They have no details on how this will happen or what he will look like, but assume it'll have something to do with that Oscorp canister he's seen stealing in the leaked set snaps.