I'm torn, to be honest... on one hand, the video is awesome, but on the other, it conflicts with what I loved about the Reapers.
The Reapers were inspired by the Cthulhu Mytho's. Think about that, they exist in a part of space we can't reach, predate us by an amount of time we simply cannot measure, have powers that could, and have, destroy us all with little effort, just being near one can effect your mind and turn you or drive you man... and they have squid faces.
Reaper's, to me, are a looming evil, not a combatant. We do not fight them. If they arrive, we're already dead. The focus of the first game, and to a lesser extent, the second, was keeping them away, keeping Pandora's Box locked, so to speak. It made them frightening, because the simple concept of them showing up looked like a Game Over for us.
And that's all changing now... I'm sure I'll love Mass Effect 3, don't get me wrong, but if it's going the direction I think it is, (finding some special weapon that kills Reapers, judging on certain clues I won't get into just now) then much of the Reapers appeal is lost to me.