I've always liked the The Inquisitor's way back to the WEG material, so I'm glad they are using an Inquisitor as it fits with established lore. I'd prefer them to give him a name though like Inquisitor ....., and not just call him The Inquisitor.
Yeah his design does look reminiscent of past Sith and Dark Jedi design but I do like it
Nar I'm glad Vader is not the main villain in it as I don't want them to over use him. I'm sure he'll be in it every now and again and it will make his appearances have more impact
I'm also pretty certain we also wont see young versions of the big three in this series, maybe Laia if Bail is going to be in it but I'd still be surprised as I don't think this series (at least to start with) will be about the Rebel Alliance, maybe in later seasons it will get into the formation of the Rebel Alliance, but to start with I think this is going to be about a single group of rebels on one ship (The Ghost) before all the many groups of rebels in the galaxy come together to form the Rebel Alliance.
Just like Vader I'm pretty sure we'll see Tarkin in it now and again, and oh man I'd love it so much if Admiral Screed was in it

I also think we'll see Boba Fett at some point and he has been over used IMO which is why I don't want the same thing to happen to Vader. Remember when Boba Fett was mysterious and cool, like before EpII came out.
Really gald to see the Imperial Troop Transporter show up, I loved that toy as a kid