Nintendo is keeping quiet about their Vitality Sensor games, but they have something called WiiRelax in development.
While searching the European trademark database, we discovered Nintendo registered the rights to WiiRelax in PAL territories. Since the Vitality Sensor is a pulse detecting accessory, it sounds like WiiRelax would work with the upcoming device.
Prior to this trademark, Pub Company, an video developer in Italy, also mentioned a game called Wii Relax (note the space). The title was officially announced on April 1 and hasn’t been mentioned since. Their website for Wii Relax is gone too so Pub Company’s “zen experience” project may have been canceled, blocked, or perhaps purchased by Nintendo.