Imgur user SuitArts posted his concept art for FIFA 16 Ultimate Team a few weeks ago and they're worth checking out if you haven't seen them already.
They certainly look pretty sleek but SuitArts' minimalist art style does mean the cards he's designed lack stats. Some FIFA fans noted that a stats screen coupled with players' animation poses while shooting would be a pretty neat idea. There was also praise of the physio concept of tracking fitness per hour.
The player bio screens are also quite feasible though whether or not anything like them will make it into the game is of course unknown at this point.
For the last two years, the Xbox versions of FIFA games have had extra players for Ultimate Team, including legend players, and it's likely those picking up the Xbox 360 or Xbox One versions of FIFA 16 can expect the same.
The FIFA Legends players last year included Dennis Bergkamp, Luis Figo, Ruud Gullit, Gary Lineker, Pavel Nedved, Pelé, Romario, and Patrick Vieira.