I haven't seen anyone of late jump up and down saying "I'm working on it!" with a big sign on their heads but there's been a lot of support in the past for it and I've little doubt it'll be kept alive though may not be available day one (or month one)
I do, however, suggest you get a backup plan in place (which is what I did on a more permanent basis
http://www.wowinterface.com/forums/s...ad.php?t=18173 ) so that you aren't dead in the water. It was some fair bit of time before MazzleUI was ready when it had to move from Original Flavor WoW to Burning Crusade flavor.