I was wondering because I was wondering if we could watch Beta 2 replays in retail, or if anything would carry over, or if we might as well delete the massive beta thats just kinda sits there on our desktop taunting us, torturing us while we wait for the 27th!
Unless you can still test maps, there's no reason to keep it. Be sure to save any maps and replays though, as maybe they'll be playable/viewable later on. (I doubt the old replays can be viewed with the full game, but who knows?)