I would be happy to participate in this program as a beta tester, if it is a public beta. I would be glad to identify bugs and submit appropriate console/network traffic, and provide brief user interface and functionality suggestions.
I watched the Dev training with Kelly last month and it was great. This is where I learned about the viewer. Thank you Kelly and everyone else in the ESRI JS staff for keeping us in the loop. This is a welcome development. And needed, now that they are officially deprecating both Silverlight and Flex.