Are you sure about that? In some of the raw gameplay footage I've seen, there are still "hidden" formations in playbooks. For example, in the Utah gameplay footage (at 2:50), you can see that their Ace F Pair Twins formation has some hidden Flex plays.
I'm betting those hidden plays will be available to choose in custom playbooks as part of the "regular" formation -- although taking them will probably count as an extra formation.
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