That's one of the negatives of running beta software... can't really be mad until it impacts the final released version.
As a software developer by profession, I can state unequivocally that this is something that MOST people do not understand.
Personally, I doubt that you will have to wait until the GA version if iOS 9.3 to be able to pair your VA to the iPhone ... but you won't get much help from Garmin if you can't until the GA version is released.