windows
Windows Phone 7.8 and Windows Phone 8 compared
Windows Phone 7.8 will receive the new Start screen in addition to the new Tile sizes, although majority of the other features will not be able to make the cut at all. You will be able to access Skype, RCS-e, and DataSmart in Windows Phone 7.8, but those will come in the form of separate apps, and will not be integrated as though it was Windows Phone 8. DataSmart will be the app of choice where users are able to monitor data usage, and RCS-e enables carriers to hook in data services.
As for Voice Command, Bing Audio, and cloud services, these will remain true all the way from Windows Phone 7.5 to Windows Phone 7.8, although Windows Phone 8 users will be receiving even more powerful versions of each.