Distributed Net is doing RC5 for the prize money. If there is big bucks riding on RC5-128, they might do it.
Then again, OGR has no money involved, but there is a definite addition to the Mathmatics Hall of Fame for finding the Optimal OGR-24 or OGR-25 values. If RC5-64 finished tomorrow, we would knock out the OGR contest a lot faster.
If you read the history of past contests, DNet has always been lucky and found the solution early in the contest. RC5-64 is 32% thru now, so not quite a third - still early.
If they're prepping for another contest, it has been very "hush-hush"