This is amazing news announced by Greg Sullivan (Windows Phone director – Public Relations at Microsoft) Windows Phone 8.0 is upgradeable.
Windows Phone 8 users can upgrade their OS (Windows Phone 8.0 to Windows Phone 8.1).
Greg Sullivan word with Computerworld
Many people who bought Windows Phone 7 and 7.5 devices are still upset at Microsoft when it was announced those smartphones would not get an update to Windows 8. However, Computerworld reports that in a chat with Windows Phone director of public relations Greg Sullivan, “We will not have the same experience as we had when Windows Phone 7 was upgraded to Windows Phone 8.”
Sullivan added that Windows Phone 8 was a “powerful OS” that can handle major upgrades, saying, “We won’t run out of head space on Windows Phone 8 any time soon.”
– Nokia indicated that its Lumia 1020 and Lumia 520 smartphones would indeed be upgradeable.
– Windows Phone 7 device user could not upgrade their devices to Windows Phone 8.x
Source of news here