Introducing a few new features such as the Tactics Creator along with additional team talk options. There are about 100 changes/improvements, but the most important one is the change of the interface/environment. It reminds of a bad Fifa Manager copy. It will be difficult to deal with the new navigation system and the colours used.
Training and tactics appear to have been polished the most, though it's mostly the same functions presented differently with some slight additions. 3D match engine has improved only slightly and it's still quite poor for a game with so big sales.
Injuries are still a big problem, especially if a player has high injury proneness.
On the bright side, there are some nice little improvements as well. Start New Game now has option filters for including players in the database, Press Conferences feature a wider variety of questions, when joining a new team you get to meet all the staff with the help of your assistant.
Link to the translated (by Google) in English (from Greek) article.