He's 6ft and probably still growing a bit. Could end up 6'1" which would be pretty tall for a winger! At that height, and with the pace he has, he could be frighteningly good. He has tricks, he drives at defenders and scares them. If he bulks up just a little, enough to hold his own but not lose his pace, he could be very (que criticism) Bale-esque.
I've said exactly that in the past about him, he is very Balesque the way he powers past defenders. He also looks stronger than Walcott on the ball already so will only get stronger and a bit more quicker barring injuries. Walcott is very nippy and probably picks up speed quicker than Miyaichi and Bale over shorter lengths. Miyaichi was leaving defender past them which was very exciting to watch. He is also a baller which adds to the excitment level.... ON a side note, apart from Bale playing for Spurs i really don't know why he gets so much criticism. He is the real deal.