HP disagrees
Maybe not officially I suppose but some folks I talked to on the side said while Red Hat wants to be the leader, Openstack is a different beast from Linux, and they don't believe at least that Red Hat has the resources to do it (right) in part because there's a lot of integration work needed at the hardware level.
I remember when Red hat touted they were the #1 contributor to openstack (and had recently suprassed Rackspace at the time I believe - a year or 18 months ago I forget), now HP is the #1 contributor, though you could say almost neck and neck with redhat (http://stackalytics.com/). I don't track Openstack closely just had to look it up.
HP thinks they will remain the king of open stack, I suppose time will tell.