See the following Google docs form to sign up as an official beta tester of TiVo's new mobile app (for iOS & Android).
TiVo Mobile Beta Testing Signup
Note the following from the first page of the signup form:
You understand that TiVo's Beta testing program requires you to sign an NDA and...
Does anyone have a good use for the mobile apps? What good are they when most of what I want to watch is unavailable away from home, and when I am home I can watch on my TV.