Good gravy. According to this, you'll be able to fly a jumbo jet in Just Cause 2. Also, you'll get "better enemy AI, a targeting system similar to Crackdown's aim-at-specific-body-parts one, better vehicle handling, better vehicles (including a...Boeing 747), less 'dead space' on the game's maps and Rico's grappling hook is now a permanent addition to your arsenal". Zowee.
These are pretty much the first details seen on the sequel to Eidos's free-roaming action adventure, and the 747 alone should keep you interested. Let's hope it doesn't suffer from the fate of the original and stumble at the final hurdle.