There's no reason to build the applications on the newest library versions. Gnome 3.8 apps should build against Gnome 3.6 libraries. Then later on release the 3.8 libraries which would, of course, be completely compatible with the 3.6 and 3.8 applications.
That would remove the need to immediately recompile everything in the universe against the new frameworks.
This is just like how in the Windows world most apps are currently built against WinXP SP 2 and not Windows 8.
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