Reading this on Engadget :
Microsoft confirms no upgrade path to Windows Phone 8, unveils 7.8 for legacy devices.
The debate can now be laid to rest: devices currently running on Windows Phone 7.5 will not be on the receiving end of the long-awaited Apollo update (aka Windows Phone 8).
One of the best features of iDevices are their capability to get the latest firmware. People don’t want new phones, they want new features. Providing them with an upgrade path for their expensive smartphones is the best way to keep them on board for the long term. My bet : Windows Phone 8 will never get any relevance in the market. Remember the Zune ? Same people, same failure.