Great trailer! I'm genuinely surprised that it was about 2 minutes long and featured SO MUCH of Vader. I always got the sense that the series was going to skirt the fringes of the Empire and that the Emporer and Vader would be dealt with in passing. As for the voices of the Emporer and Vader? The voices were DEAD ON! I was left wondering if REBELS actually managed to get Ian McDiarmid and James Earl Jones on board for some voiceover work. And Vader taking on those A-Wings in his personal TIE Fighter? That was fantastic!
It also looks like there might be at least another Inquisitor in the mix. Because there were a number of red lightsabers featured in that trailer.
The red lightsaber staff definitely caught my attention and got the wheels spinning. I think that may be a hint at the return of Asajj Ventress. Her storyline never got fully resolved at the end of CLONE WARS and she went underground. The individual with that lightsaber staff didn't seem overly hostile to someone with a blue lightsaber in one shot, and also had a hat on that looked reminiscent of something the Night Sisters wore.
Overall, the tie-ins with CLONE WARS seem substantial. We know Ahsoka is back in the mix. Asajj Ventress may be a factor, too. And now we're going to see Rex and some of the 501st Clone Troopers as well? It leaves me wondering how Filoni and company will write around Order 66 and especially Anakin's use of the 501st in the sacking of the Jedi Temple.