They're definitely a new model additional to the Yuma GTX and they're not, I'm told, available in the UK, though you could source them direct from Europe.
They're clearly very niche and they're going to be expensive because of the spec. But if you're looking for a high spec junior technical alpine boot, say, for a trip to the Alps, then it may be of interest.
No-one's saying that you have to spend that much on kid's boots, but if your sprog is a tear-away mountaineering tyro, and there are some out there, and you feel the need to invest in full-on technical footwear for them, this looks like being one of the few options available. The fact that Hanwag isn't bringing it into the UK tells you that there's a small market for the boot over here. It might make more sense for teenage Alp dwellers.
The image was provided by Hanwag. It might, possibly, be of a women's version of the boot and that would also explain the sizing confusion. It's titled as the 'Junior' version of the boot though.
Sorry for any confusion, hope that clears things up.