As well-read students of gameology will know, and any who've asked me for my wisdom will have heard, the two main prongs of good gaming are grappling hooks and double-jumps. Once both those two are in place, you've essentially made a perfect game. It's quite simple. Now, Just Cause 2 doesn't have double-jumping, but according to this graph I'm imagining it turns out that this factor can be replaced with infinite parachutes, so long as the grappling hook can double as a tether. It's a complex graph. Evidence for why I'm hopping from one leg to the other in anticipation for this one can be found in my E3 impressions, and indeed in the new trailer, below.
There's only one way they can screw this up: not let you do the stuff the game says it will let you do. I wish this were as ridiculous a thing to say as it looks. But somehow almost every game that promises such amazing freedom to muck about releases itself with so many restrictions and conditions that you feel straight-jacketed. If Just Cause 2 can really be this enormous playground packed with the potential to tether everything to everything else, then make it explode, it will truly be one of the finest game toys ever made.
Don't worry - the first half of the trailer is a bit poop, but then it gets going, and by the Jumbo Jet you'll be checking for a release date. (It's February next year.)