Colleges are also allowed to change jerseys on a whim, and jersey/apparel contracts are with individual universities, not the league. The NFL and teams will not have uniform changes dictated to them by Nike.
The "pro combat" is a new MATERIAL used by Nike in making jerseys. They used those crazy designs you've been seeing in the collegiate ranks as a marketing ploy to get the word out there about the new jerseys. FSU wore the pro combat "style" for one game, and that was it. As far as i know, we're getting the pro combat material jerseys just in our regular unis.
Pro Combat is the material/apparel/clothing line. It does NOT mean new color schemes, new designs, etc.