If you think about it though, all of the peripherals shown at this E3 from all three companies have very very very few games that can use the peripheral.
Microsoft's have no controllers at all, so that eliminates most traditional games like FPS, TPS, possibly RPG's as well, etc.
Sony's have no analogs (I know people said that they might add it when it goes to sale, but as of this moment they still have a lot of bugs to fix).
This vitality sensor will probably be cut from most traditional games, but I can see fitness games using this. In fact, all three can be used for the fitness market, the minigame market, etc. Which begs the question...does MS and Sony really think they can get a considerable size of the blue ocean market now that Nintendo has dominated it for so many years, or do they expect that Nintendo's market will "graduate" to them?