Gamertell has posted an article based on an interview with Tim Spangler, the art director for the Wii release of Madden NFL 10.
From the interview:
"According to Spangler , the game has undergone drastic changes. 'The visuals changed across the board, we have an all new interface, all new character models, stadium and game modes.'
This is also the first year where the characters will have different body types... 'Defining body types was the hardest to do graphically but it was something we really wanted for this game.'"