All along, I've never thought it made sense for massive overhauls for most teams...the pros have so much more invested in their brands (as compared to colleges), and a massive Nike-driven overhaul could really turn-off a bunch of their fans. I can't imagine old school unis like the Browns, Packers, Bears, etc. changing, but I can certainly see it for the more "modern" teams. I think I'd also read something about how teams can't change logos/uniforms any more than once every 5 years, although I can't really remember off the top of my head if any team has done that since 2007.
I'm glad the suspense will be over soon though. It's interesting that no one has any idea of what to expect too...