Kotaku's Owen Good has posted what Madden NFL 13 Connected Careers gives and takes away. He also spoke with Josh Looman on something they might add to the game.
Looman, when I revisited this subject with him in L.A., told me that the development team was still on the fence about one meta-game feature in Connected Careers, which I pleaded with him to keep. In an early build, he told me that creative director Mike Young created himself as a 37-year-old journeyman quarterback, rated in the high-70s but with declining attributes. At that age, the XP spend to improve or maintain skills is also more expensive, creating a considerable challenge even at Pro difficulty. But Young gutted it out and was named Super Bowl MVP, in a great story of a veteran plucked from the scrap pile to win it all.