The QtMobility API while deprecated is still being updated and is still available and according to a thread on the Qt Developers it should work with Qt 4.8 (it was only officially supported up until Qt 4.7). According to the documentation it can be used for desktop applications, but they are mostly tier 2 platforms.
While Qt Location won't be ready until Qt 5.2 (expected at the end of November), I wouldn't expect it to drop support for platforms that are already supported in QtMobility.