Order the T-Mobile Contract Free one although people are saying that it is locked, it will be your best bet if you dont want to wail in line at 19. Even if it is locked, you can always return it to Apple and head to the ATT or Verizon store to get one at full retail price. But it seems like now the demand is so high that if you miss the preorder tomorrow, you might have to wait for weeks to get another one.
I went to an "authorized" T-Mobile store today and asked them if they do pre-order or not. They said they are charging $1200 for 16GB iPhone 6 Plus unlocked! What a rip-off!
I am on ATT contract and I am planing on buying it at full retail price, pay ETF for my current contract, sell my old phones which are unlocked already, and just get a prepaid plan with unlimited everything 😎