updated 09:15 pm EDT, Tue April 17, 2012
Windows Phone Apollo may reach all devices
(Update: no?) Talk of Windows Phone 8, or Apollo, dropping backwards compatibility with existing phones may be false. A video interview (below) with Microsoft Evangelist Nuno Silva posted by Portugese site Zwame suggested that "all" Windows Phone devices, even from the first generation, would get the next version of the mobile OS. He was explicit in mentioning early models, such as the LG Optimus 7 and Samsung Omnia 7, as qualifying.
Outside of the interview, Microsoft has barely acknowledged that a future version of Windows Phone is in development and has been shy on version compatibility. It has promised that the next major Windows Phone version will run existing apps.
The OS has raised compatibility questions mostly out of a belief that 8/Apollo is a significant break from how WP7 behaves. It may have enough code compatibility with the desktop that its apps could run on Windows 8 with minimal porting. Most expect Microsoft to at least have some new features in the new version that will require new hardware.
A hard cutoff was considered unlikely given that it would alienate those who had bought phones even from just months earlier, such as a Lumia 900. [via WMPowerUser]
Update: An unofficial but "trusted" source speaking to The Verge claimed that there would "absolutely not" be an upgrade from Windows Phone 7.5 to 8. Microsoft, when cross-checked, would only talk app compatibility and not OS upgrades. While corroborating an earlier tip, it could risk orphaning every existing Windows Phone owner and hurt Microsoft's chances at regaining market share lost over the past several years.