Yeah, I'd definitely guess that those are some Royal Guards that have just been disposed of. You can see a lot more red in the second clip with Yoda.
I've pretty much avoided all spoiler talk, so seeing this gives me several interesting plot points to speculate on, especially the Mace confrontation. I also wonder at what point in the flick Vader will "rise". Will that be the closing scene, or is Vader himself gonna get some action in ROTS?
Definitely more of an OT feel, I agree. Likely because you've got so many of the players now - Vader, Chewy, shiny 3PO, (identical) Tantive, and the rest of the usual suspects... Of course having clips and dialogue included from the OT in this trailer certainly helps as well.
I'd like to say my hopes remain high for this one, but seeing what we got in the prior two, I'm going to keep my expectations relatively low. Hopefully George will surprise me though!