On the aspect ratio issue for IMAX stuff in home viewing, I think it depends on how its done. In Catching Fire and Tron, I have no problem with it. I think they handled it well. But for TDKR I thought it was really bad. It was super jarring, every other scene it seemed like it was switching back and forth and on the Blu-ray it seemed like the regular shots were not as high quality as the IMAX shots, which was jarring in its own way. So I think its all in the use.
I think the X-wing looks good. Blew my mind when I finally realized how the wings were going to split. Its sleeker but still look has a distinct OT look, which can't be a bad thing. I'm a fan of JJ so I'm looking forward to seeing more.