Even though I want him to, I don't think Tomic will do anything. He's spending as much time partying as he is training (possibly more time partying).
I think Jerzy, Milos & Grigor are slowly coming into their games, and will do some big things in the next two years.
Vesely has yet to do much on the main tour level, while Kyrgios qualified out of nowhere for the French Open & won a round, before qualifying for the US Open and putting in a respectable performance against Ferrer. But I think it will be another 3-4 years before any of their generation becomes a serious factor.