DeuceDouglas over at OS put out an extremely in-depth mock up of features that Madden fans want to see added into the game, complete w/ diagrams.
It's been bumped to the first page for going on a year and a half now, so it's proven very popular among the "franchise" base over there.
Triplechin also put out his own list of features w/ photo help from Deuce that's proved popular as well.
Pretty sure a lot of these ideas are already being considered by you guys considering the depth in your other titles, but I figured I'd post them up here if anything was missed and to get a nice look at exactly the features many franchise guys would like to see.