
I've been in many betas before and, usually, you don't need to re-download the whole thing. More like you download a "patch" that takes you from beta version to retail version.
Other than that, for those orders, the release dates are when they are in stores, so if you were gonna get yours by mail, you likely will get it at (release+shipping time).
Other than that, for those orders, the release dates are when they are in stores, so if you were gonna get yours by mail, you likely will get it at (release+shipping time).