I mailed to the email address mentioned and this is what I got:
"Thank you for your interest in partnering or developing for the Microsoft Health platform. We have been excited to see the response to our announcements and are actively working to respond to each individual inquiry.
There has been great interest in an SDK to the Microsoft Band and the Microsoft Health platform and the team is still working to finalize the SDK. Please stay tuned for additional details and timing for the SDK completion.
Sincerest thanks,
The Microsoft Health and Microsoft Band team"