Yeah but thats better than "Windows Light" which is what it really is. I think WOA was a fine acronym and they could have left it at that. (I guess they decided that the consumers wont know what ARM is :-P )
I don't think that the name for Windows RT matters. If it can't be bought in a standalone package, your average consumer will probably have little exposure to it. They'll probably just see a tablet in person via an aquaintance or in a store or they'll see it online and it will simply be said that it has Windows 8 on it. Who cares about the version name, especially when it's the only one available for that type of device (differentiating the x64 versions on slates)?