So it looks like the VitaTV is indeed JP region locked
http://www.neogaf.com/forum/showpost.php?p=89636385&postcount=61
I imagined that was going to happen. I mean, it's not that it's region locked. But the VitaTV will probably have their own store (since there are uncompatible games), so obviously you can't access to your PSN account until the service launches here.
The same happened with the Vita in the first place, right?