I'm not that impressed... lots of sparks, welders, seems to be built on Earth, and a very old Nemoy... I don't recall many ships that were built on Earth, Cochran's Phoenix was, but the NX-01 was built in space, and that was in the 22nd century, so why should the Federation have to build ships back on the ground in the 23rd century? A look around on startrek.com I found an article for the Enterprise NCC-1701 that says:
"Launched in 2245, the original and illustrious starship U.S.S. Enterprise NCC-1701 was built in the San Francisco Yards orbiting Earth." (http://www.startrek.com/startrek/view/l ... 70377.html)
This means the film will likely have major history rewrite (or just lack of research) I'm not too bothered about rewriting history, every series did a bit, but seriously, welders? The dirty and dark conditions that the ship is being built in, coupled with the fact that it is being welded by hand, is not what I would call safe nor accurate engineering required for constructing a large space ship. I'm sure even today we use robotic welding to build spacecraft. Not impressed so far.
But I guess they've achieved their aim in releasing this teaser, as it should get a lot of trekkies talking.