From the little I have seen he looks like he could be something special.
However, I doubt that he will develop with United as they and they supporters appear to demand established big names these days.
If he is to fulfill his promise ( assuming his ego doesn't take over and he adopts the Premiership moneybags attitude) he needs to play first team football on a regular basis and in the same position.
Newcastle would probably be a good bet but I doubt that United will loan him out but continue to use him as an impact player.