User blog comment:Bluegear93/VGA Mass Effect 3 trailer/@comment-3268946-20111211204302/@comment-737801-20111211230922

I just looked at the article again, and some of the other things, and it is extremely vague on where it happens, but it does look like Tuchanka. If not, then I'm guessing a desert planet somewhere like Trebin. But considering there is a stalbe atmosphere, Trebin is unlikely.