General question about custom playbooks

What limitations will be placed on the creation of custom playbooks? For example lets say a custom playbook can hold 400 plays. Are we going be able to have an unlimited number of formations represented? I remember when I use to mess with custom playbooks years ago you could only have 13 formations. Does anybody know (gibs/farls) if there is a limit on the number of formations in madden 12?

i can't remember the exact number, but it's under 20