I don't think he sees his future with us, in anything but the short term. He'll be looking to get back to the premier league as soon as possible and probably back to London. But if he helps keep us up great and if we have him in a secure, favourable contract, there may well be a tasty transfer fee to be made one day. But as Danny says, if it's the shop window he wants, he better start playing good football rather than silly buggers.
It's definitely a mutual agreement, but that's what it's all about for 99% of players unless they are at Real Madrid!