hahaha wow you guys.. I actually know what this is (leave it to the electronic composition junkie)
It's called the tenori-on
it was designed by some japanese dude and picked up by yamaha. it's expensive as hell, like 1000$ and is still in its initial launch stage.
http://www.sonicstate.com/articles/article.cfm?id=138
sonicstate is a site i visit religiously, I love it. they have some very technical reviews, and if you watch this one, it kidna comes across as "not worth it"
still, cool toy though.