In case anyone is interested, i think this is her latest Interview:
http://www.squareenixmusic.com/features/interviews/michiruyamane.shtml
It covers her most recent works AFAIK, such as the Box Set and the Concert at Stockholm. 
Yeah, this one I had read, but I'm wondering if she actually managed to do anything outside videogames or not. It would be interesting to know, not just to dig up what she did and listen to it, but also because I guess her partecipation in videogame OSTs for the future also depends on her success outside of them.
She's mastered the midi-quality console world quite well, but I don't see her having worked on music on next gen consoles at all. If she can break the wall of challenges raised by having an aural standard that doesn't allow for synth-sounds and keyboards only, she could probably contribute a lot more to the industry. And if she's working on tv soundtracks or simply to release her own music, she's certainly getting more experience (heck, assuming she needs it, who knows at this point) in that field. I'd be thrilled to hear something from her that doesn't feel like it belongs to the 80s.
Or maybe she's just slowly retiring. She seems to discuss the idea of slowing down and letting go of full time employements in all interviews I read. She's not a teenager any more after all, and she's worked in the field for 3 generations of consoles.