Where are they? Possibly inside of a plane? A storage unit? Just a random building full of bad guys? I'm going with plane due to the rest of the preview, and there may be parachutes along the wall.
How did Hobbs get that much air? Look at the bottom left corner, did Hobbs jump off a trampoline to do this? I think there is a trampoline next to that SUV. Why is there a trampoline next to an SUV? Because it's awesome.
Look at all the carnage that has already been done. What did those wood splinters make up before it was destroyed by unstoppable violence? It could have been anything. Was it just an empty crate? It could have been a box full of steroids judging by the bad guy. My best guess is a "rock"ing chair.
If there is any justice in the world, this movie will break every box office record imaginable. I can't wait.