I ask myself the same question... I hope there will be a Blu-Ray version at all... Maybe not for the pilot episode, but for the complete seasons later on. But I'm afraid they might treat us with the inferior DVD version first... I'm still waiting for an ELEMENTARY BD release and since Rebels is considered a kids' show mainly, they throw it on DVD first (as kids don't care at all) and MAYBE re-release it for the adult Star Wars fans on BD later on, after we've bought the DVD due to lack of an alternative... Meh!
I really hope I'm wrong, but no DVD will enter my player this time!