At this point, the only two japan centric devices are 3DS and on a smaller scale, Vita. Unless you mean by backing, but I mean sale wise.
And sale wise... well; I dont think there's a japanese centric home console.
For what it's worth, I did specify home consoles. The PS4 will end up around 8-10 million units sold in Japan by the end of this gen, which still makes it a worthwhile market.
I don't think anyone is under the illusions of consoles returning to the pinnacle of the PS2 gen, due to the rise of mobile.