I think it's going to have separate betas like they did with Yosemite last year. Developer betas and public betas. In that case I'll still test the developer betas instead of the public beta. It gets less updates than the developer betas.
As pointed by 9to5Mac :
They will do it that way only. iOS 8.3 beta 3 for developers is 1st public beta for public and like that only. Like they did for Yosemite.
If your expectations are that any part of the process be "pain-free", then you should definitely not be testing beta software. Beta testing requires a willingness to live with potentially serious bugs and to deal with restores, reinstall, resets, etc.
If your expectations are that any part of the process be "pain-free", then you should definitely not be testing beta software. Beta testing requires a willingness to live with potentially serious bugs and to deal with restores, reinstall, resets, etc.