I think it looked pretty good. Really good to see OT stuff on the screen again. I cannot wait to see it replace all the PT junk we have in stores now.
At the same time, literally nothing happened in the trailer, so I can't make any judgements beyond how it "felt" to me, and it felt pretty close to the OT.
I was hoping it would be a little more distinct from the Clone Wars in terms of looks, and while characters are definitely a little "softer" I can't help but think that this is prototype rendering because I don't see why they would abandon the polish they had in the Clone Wars... if you watch that in 1080p the textures look almost hand-painted in that you can almost see brush strokes on them.
It could be that they're working with a budget similar to what they were working with for early seasons of The Clone Wars and will eventually move forward from the look they have now, but, again, it's a pretty proven format so I'm not sure why they'd slash the budget.
Either way, like I said, I can't make a super solid judgement on it at this time beyond that I trust in Dave and think he did an incredible job with The Clone Wars and that I'm excited to see the OT-era back on screen again.