Have a look at http://www.fmscout.com/a-football-manager-2012-wonderkids.html
for a complete list.
Sebastian Toro (Colo Colo)
Siyanda Xulu (Mamelodi Sundowns)
Craig Dawson (WBA) -> scores plenty of goals for a defender
Diego Polenta (Genoa)
Ricardo Rodriguez (Zurich)
Jerome Roussillon (Sochaux)
Sime Vrsaljko (Dinamo Zagreb) -> everyone seems to buy him in their stories
Michel (Almeria) -> really attacking RB
From these players, I have played with Toro, Polenta and Rousillon.
I can vouch for their quality.
I have either played against the others or scouted them at some point.