Hello there. I see you posted to the find a consultant forum. Do you have a request for hired help that you need a consultant for, or was this posted to the wrong forum?
To answer your quest, as best I can. Please see this post by Lisa with instructions on how to request to be part of the Preview Program.
Thank you for your interest in the REST API. Take a look at How to access documentation for Wowza Streaming Engine REST APIs. At the bottom of the article is information on how to can request to be part of the Preview Program.
-Lisa
Kind regards,
Salvadore