What Star Wars Rebels could have been,
If not for Disney's goal of domination by their animation style.
Whew, bullet dodged there...
I think that trailer is awesome, but you're not going to see a weekly TV show using that level of animation for a very long time. It's too costly and time intensive to render for the kind of timetables that television shows have to employ.
It's also not Disney's style, it's Lucasfilm's from the Clone Wars cartoon. As styles go I think the current one is a pretty good blend of cartoon-ish characters and nice, hard-model looking FX shots like the ones we've been enjoying.