Announcing Windows Phone 8
As you can see, we’re making Windows Phone 8 even more personal, with a new palette of theme colors and three sizes of Live Tiles, all of which are under your control. We know Live Tiles are one of the things current owners really love about their Windows Phones, and we wanted to make them even more flexible and unique.
The new Start screen is so useful and emblematic of what Windows Phone is about that we want everybody to enjoy it. So we’ll be delivering it to existing phones as a software update sometime after Window Phone 8 is released.Let me repeat: If you currently own a Windows Phone 7.5 handset, Microsoft is planning to release an update with the new Windows Phone 8 Start screen. We’re calling it “Windows Phone 7.8.”
Some of you have been wondering, “Will we also get Windows Phone 8 as an update?” The answer, unfortunately, is no.
Windows Phone 8 is a generation shift in technology, which means that it will not run on existing hardware. BUT we care deeply about our existing customers and want to keep their phones fresh, so we’re providing the new Start screen in this new update.
(vía Windnows Phone Blog)