I just added GNOME 3.12 copr repo. It failed to update. Here is the log. 

http://fpaste.org/79484/39308938/

The problem seemed the latest cogl dropped the compatibility of old version so that cogl could not satisfy the requires. 

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On Sun, Feb 23, 2014 at 1:16 AM, Richard Hughes <hughsient@gmail.com> wrote:
On 22 February 2014 16:51, Rahul Sundaram <metherid@gmail.com> wrote:
> Can you add a dependency from GNOME Shell to GNOME Control Center?  I
> installed GNOME Shell and settings didn't work till I install the other
> package separately

I think this should be done in rawhide first. If it happens there it
gets rebuilt in the copr automatically.