I'm almost certain they will come out with additional Ultra models in the future. This first offering seems like they're essentially testing the waters with the one size & only one color. Assuming this first Ultra sells well, which it almost certainly will, they'll probably expand with different sizes/colors within the next year or two.
I will replace my Ultra when they come put with a SS case. I'm looking forward to that, this is my first non-SS AW, and I already have a small mark on it. The 4 SS AWs I've had looked brand new years into use.
I know they will come out with all the other cases, at some point.