It now appears that this was simply just a bit of incorrect terminology and all players who pre-ordered will get access to the beta for the entirety of it.
Bethesda’s VP of Marketing, Pete Hines, seemed to have conflicting ideas to how it would work (at first), but later confirmed that players would get access to the entirety of the beta, and said that there might be a little bit of activity before hand.
The whole thing is a little bit confusing still, but surely Bethesda will work it out before launch.
Everyone gets into the full BETA for their platform. Start to finish.
No, we were trying to let folks know about something that might happen in addition to BETA. Instead it came off as possibly limited access to BETA, which was never our intention. I'm not really into gimmicks.