It seems theres a slight misconception going around that if you Pre-Order, you get the 1st and 2nd Hokage as support characters. actually you get EITHER the 1st or 2nd depending on where you pre-order the game from, If you wanted to get both, you would have to preorder twice from different sellers, and that would kind of suck wouldn't it?
If you stop by your local GameCrazy and preorder, you’ll receive a download card with your game that will unlock the Hidden Leaf Village’s Second Hokage as a support character and also provide a new single-player mission. If you decide to go to GameStop/EB Games’ website or store and preorder, you’ll get a card that unlocks the First Hokage support character and another single-player mission. Since these are going to be cards that unlock downloads, they’ll most likely be good for one download only, so you’ll have to decide which Hokage you think looks best. (they are both downloadable for a fee after the game comes out also)
Most know this but I'm just clearing it a little for those who didn't know.