Windows Phone 8 Devices Will Be Upgradeable
Microsoft has confirmed that devices running Windows Phone 8 will be able to receive significant OS-level updates. The same is not the case with Windows Phone 7.x devices, which cannot update to Windows Phone 8. Greg Sullivan, senior marketing manager with Microsoft, said, "We're going to have an upgrade path going forward. Windows Phone 8 can evolve. We have an architecture that enables portability and is fundamentally hardware independent." The base code used in Windows Phone 8 is significantly different from that used by Windows Phone 7, which is why older Windows Phones are stuck on earlier versions of the platform. Sullivan did not provide any more specifics about what forthcoming Windows Phone system updates might entail.
Poor Lumia Users....
I call BS on that one. Remember when they said the same thing about the HTC Wing not being able to run version 6.5? And xda made it happen.