They will announce it but it will be hard to get I imagine. Microsoft's Band has not been available online for over 2 months. This will be a growth area if it covers health and we can measure blood pressure, glucose levels etc. It will be like having a doctor monitoring your health 24 hours a day. I will also be interested in what apple watch has for battery life or charging options.
By the way, Microsoft did release an API for their Band product.