In addition to the marketing partnership, the AHA and Nintendo will host a "multidisciplinary summit of representatives from a variety of fields ... to take a closer look at the synergies and benefits of active-play video games," entitled the "Innovation Summit." No details have been provided on when and where said summit will occur. Finally, various "active-play Nintendo video games" will be available to play at select "Start! Heart Walk" events this fall.
Also, no, Nintendo hasn't explained the Vitality Sensor yet.