Don't get over excited about this one,Crewe were keen on signing him on a permanent as Arsenal don't want him,league 1 player in my opinion and not sure he's ready for our team I've seen him play for Crewe and don't think he's as good as Smith,yet maybe one for the future.Chuks Aneke rumored to join us, would be a brilliant signing.
To go into a bit more detail, from what I know of him he officially midfielder put often plays in attacking midfield/center forward role. He's a pretty big lad and scored some decent goals last season and would be a massive coup on a free transfer.
I thought he was about 23/24 but according to Wikipedia he is 20 and hes apparently good mates with Poleon.

