Description of problem: glest is being removed from F18 since upstream is dead and megaglest is available. I think it makes sense to have megaglest obsolete glest <= glest-3.2.2-12.fc18 in F18 and devel (they'll be different tonight after branching).
I think as long as there are no storage space issues neither build/conflict issues with megaglest and the original glest, it actually is good to have it around. I just think it would not be wise to have megaglest automatically remove an installed glest; Personally, I play the original glest from time to time :-)
Note that glest was dropped in F18 since there is no upstream any more. But if you think it is better to leave glest installed when upgrading a system, that's OK.
Spec files for rawhide megaglest and megaglest-data were updated to obsolete the last glest and glest-data packages that were available in Fedora.