In this interview by Zwame, a Portuguese mobile forum, with Microsoft Evangelist Nuno Silva, Nuno rather explicitly makes it clear that all current Windows Phone 7 will receive the Windows Phone 8 upgrade.
The conversation goes as follows:
- Q: In terms of devices, who today have one is it expectable that
- A: What Microsoft said/stated and what I'm allowed to tell you is that all actual devices will get upgrade to the next major version of Windows Phone (we're talking about Apollo)
- Q: When you say actual devices. Are all that came out to market?
- A: Are all that came out. Since the first generation that were bought. The LGs and SAMSUNGs.. OMNIA 7 which were the first devices with Windows Phone reaching the market.
Source: http://goo.gl/We2V2