If I understand you correctly, you're wondering if you would be able to upgrade your 360 to the 720 down the road? I can almost guarantee no. I have no sources, but I'd guess that there will be a whole new motherboard, processor, whatever...in the 720. It's been years since the 360 came out and with the advances in technology, I can't believe they would stick with the same base. In addition, once you open the 360 up, you void the MS warranty, etc. so I doubt MS would have an upgrade that would make you open the system up. Just my two cents.