I am imagining that it will be similar to jumping in the Elder Scrolls games (not the MMO, as I've no idea how it works in that). I know it's akin to heresy to compare the two here, but it's the closest comparison I can think of for how I'm assuming it will work: you can jump freely, but it's used primarly for mobility in the world, not for platforming-style puzzles.
So, in Oblivion and Skyrim, there are a small handful of what might be considered "jumping puzzles": things that you can get to by cleverly figuring out how to manipulate the physics well enough to jump to them. But unless you're into it, they're not usually worth doing. They're by no means necessary to the game, and even if you're a completionist you can probably figure out another way to get the items that are out of your reach.
That's how I'm picturing it, anyway. I'm probably wrong, if for no other reason than because I said it on the forums.