The Wii Vitality Sensor debuted at the 2009 E3 gaming expo. Then it was too mellow for last year’s and this year’s E3. Why?
https://kotaku.com/wii-vitality-sensor-too-mellow-for-e3-5564461
When asked this question earlier in April, Nintendo replied that it was still in development, but wasn’t yet working on 99 percent of Wii players. Thus, it doesn’t yet have a release date.
https://kotaku.com/not-everyone-can-smoothly-finger-the-wii-vitality-senso-5796550
At today’s Nintendo Q&A, Nintendo’s Shigeru Miyamoto said that Wii Vitality Sensor development continues, but the device isn’t as consistant as Nintendo wants it to be.
https://kotaku.com/live-at-nintendos-e3-2011-mystery-developer-q-a-5809704
Nintendo is continuing development on it and other sensors to bring out the experience.