During Comic Con, a brand new behind the scenes video was shown to fans, revealing quite a few impressive sets and practical effects used throughout the film:
And if you somehow missed the extended teaser trailer, or just want to watch again, here it is:
Abrams has said mostly what fans have wanted to hear going into the making of the first Star Wars film in 10 years, including deciding to shoot on 35mm, and an emphasis on practical effects in addition to what will obviously be quite of bit of CGI:
"It's Star Wars," continued Abrams, "there'll be an endless number of effects that'll be done, of course. But we needed to set a standard. You wanted it to be legitimate. Building as much as we could was a mandate."
"Even before ILM [Industrial Light and Magic] gets started, you can watch the movie and see what it is."