Alright, apparently there is a lot of confusion, regarding the Prestige Shop. Here is the F.A.Q.
-If I'm max prestige in all the games, does that mean I have 4 tokens?
This is what I know about the Prestige Shop, Robert Bowling Announced about the Prestige Shop, telling what various items you can get when you prestige in MW3, and it here is all the items you can get.

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And with that when you prestige you get to choose from the following. And now, then. On to answer the FAQ, it doesn't matter if you get to max level in all the Cod's, you will still get four tokens. Four-Zero-Two, announced this special if you have presiged in any cod, you will be rewarded with one token. They're holding this for the fans of Call Of Duty, to get introduced with the new feature which is Prestige Shop. So, if you have prestiged only once, you will be rewarded with a prestige token. And for you that haven't there will be a Double XP event, starting on October 27th, so you can prestige, for those of you that haven't. Hope I cleared this up for you, and I can understand that the Prestige Shop can be confusing, as I didn't understand it, as you can see.

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But, I hope this cleared this up for you.
Also, here is the video, about Robert Bowling talking about the Prestige Shop if you haven't seen it.

Tell me if this helped or not.
Also, if you still have ANY questions, just post it, and I'll do my best to help you out. And if there is anything you have for me to add to this post, just tell me.