He seems to hint that what happens in say season 12/13 will be relevant in season 14, ie if your player scores loads of Europa league goals this boosts his value for the next season, I hope I'm not reading more into it that it just changing the value and I'm hoping that some kind of simple history/record system is in place on players, it's really dumb that there's no log kept of their purchase fee then their goals/assists/cards/avg rating for each season, it's just a few bits of text.
Club and competition history would also be nice.