i think this technology looks promising and should be a good addition to the ps3... i think sony has a better hardware quality than MS (ps3 vs xbox360) so i really believe the new wand-remote will be up to the expectations.
I agree with Hirai's way of thinking, what use is to release the motion controllers with some eyetoy games or a half assed Wii Play copy.
Sony will have to create something like Little Big Planet or Eye of Judgement, something innovative and really entertaining that merits an investment on those controllers.
I figure the tech demos shown at Games Com are a good idea to develop, maybe a Siren game based on the Survival Horror demo, Medievil, Genji or even Arc the Lad for the Sword Demo and I can also imagine a Patapon Downloadable game using the motion control like drums or something like that. If any of those ideas gets developed I will for sure get them.
I enjoyed the Eyetoy but the games were kind of limited, with this kinds of control I bet I'll enjoy it even more.