From what I understand, there is still no official info on this. I've spent many hours in Alpha and doing the same in Beta. While it is true we are testing this code at our own free will, I would prefer not to level up for the third time. While thoes 8 levels wouldn't hurt day one players that were not in the Beta, it would still be a nice symbolic gesture and reward for the rest of us here.
Everything from the Beta are said to have a possible chance to transfer over. However, this is Bungie's stress test to see if they can. If they succeed, everything in the game from Beta will be into the full game. If not, well, you will know that as well. As for statistics, I haven't gotten a clear word of that either, likely the same story.