Im pritty sure come 2010 Natal will be bundled with every 360 and they will do a huge advertisment about it and how they are relaunching the 360 and how its like a whole new system.
By doing this ms will probably get already 360 owners to buy a nother 360(natal will also be sold as a stand alone) as well as new owners.
The price wont change at all from what it is now. Fact is ms needs to stay cheaper than the ps3 and wii we know this and so do they.
Apart from games that will run on Natal nothing will change with the 360 meaning older models will still work fine. I do see some options maybe for people with Natal like we saw on the Vid e.g.
Voice actavasion
Motion controll for the dash board things like that.







