The 5 seat version is exactly the same as the 7 seat version except you cannot 'unfold' the seats. You gain zero cargo space over the 6/7 seat version (if you count the space between the two second row seats, it has less cargo capacity than the 6 seat version). I had this confirmed by two different reps at the event. In the 5 seat configuration, the entire back area is at the exact same level as the folded 3rd row seats. I think this was an unfortunate choice, if instead they made the cargo area go down all the way, while it would be hard to load, I think it would be a winner for some customers.
Interesting, if that's truly the case. I would guess that there will still be the raised platform, but it would be slightly lower due to the fact that it doesn't house the folded 3rd row. It's possible they misspoke and just meant that the 5-seat version wouldn't have a "flat" cargo area.