Last I heard such a deal would be worth 9M Euros, so his total worth is obviously estimated at 18M Euros.
Don't know how long the contract terms are to be. He seems to like it at Everton or he wouldn't be so quick to be going back.
Man City would've been a good destination IMO, they just seem to have more overall potential in comparison to Everton.
I think he's left a good impression in England but I guess not enough for a larger club to take a risk on bringing him in. Personally, Fernandes is a player I rate.