I end up with an empty /usr/share/grub/themes/starfield directory causing a warning when running grub2-install. If I don't enable USE=truetype, there shouldn't be the empty directory there at all I guess.
The problem with grub-install has been resolved upstream. You should see it the next beta release. http://lists.gnu.org/archive/html/grub-devel/2012-03/msg00126.html The empty directory still gets installed, but it should be harmless.
Confirmed: the fix for the grub-install warning is in beta 2.