Description of problem:
grub2 contains configuration material that uses os-prober to create menu entries for other OS installations. In order to make sure that this functionality is enabled, grub2 should require os-prober.
Apparently os-prober isn't on the Beta TC1 DVD, which would make this bug a Final blocker, as this bug will solve the problem of os-prober not winding up on DVD composes. I'm not sure it's a Beta blocker.
*** This bug has been marked as a duplicate of bug 678456 ***