I have a couple of players that I would like to add to this list.
The first one is Pragyan Ojha. The Indian leg spinner did pretty well in the recently concluded IPL, but I did not think he would have the same level of success on the International circuit. (Maybe the IPL is truly a global phenomenon.)
The second player, and this is a weird choice, will be the 35 year old Australian born Irish cricketer, Trent Johnston. I know, not one of the young players, but certainly one to watch out for. Although he has played less than 50 games for Ireland before this ICC T20 he has the experience of playing for New South Wales from 1998-2000. His line and length are reminiscent of another great bowler from Australia. (Anyone familiar with Pidge?)