There were links to Evangelis Marinakis earlier in the year, where it was reported he wanted Edu to join his network of clubs (Nottingham Forest, Olympiacos etc). But nothing seemed to come of it. Looks like there was truth in those reports after all!
Miguel Delaney also said that Marinakis has offered to treble Edu's current salary.
I can understand why he wants to leave in this context - 5 years at one club, wants a change, higher salary, more power across a range of clubs. Good luck to him.
Just have to make sure we appoint the right person to replace him and keep it moving. I'm sure Arteta and KSE have known about this before it became public knowledge.