modemmanager-0.5 has been released on August 2nd. Please add it to the tree. Thanks in advance!
Doesn't this need networkmanager-0.9? Anyway, this is in the GNOME overlay and will get added soon.
See announcement mail linked in URL Field: "MM 0.5 is the first release of the 0.5.x stable branch. It is compatible with (among other programs) NetworkManager 0.8.x and 0.9.x."
Added to the tree, thanks for reporting!