Don't worry, the first ones will probably be 5.3.2, 5.4.0. and 5.5.0 if you ask me.That's the point. How long will it take to port each firmware version?
First the FW's with most people in them, he wouldn't start porting it for people on 2.0.0 or other low Firmwares because pretty much nobody has a Wii U on that FW.