My biggest fear is the fact barca haven't played before at the new Wembley while the Mancs have, and considering how dodgy the pitch for Wembley has been quite often, it could have a detremental effect on the way Barca play if say for example the ball doesn't move quickly or has divits on the pitch causing bobbles.
Look at how Arsenal played whenever they play at Wembley, they've always not been able to not play at their best and partly that was due to the pitch like the Carling Cup final this season ( although brum played them off the park). The Mancs have played at Wembley when the pitch has been bad and can change their style of play to suit the bad pitch while Barca can't, like when they played Villa in the Carling cup semi final last season.
Upcoming world class players IMO for 2014 WORLD CUP:
K-P Boateng, Gotze, Sturridge, Kroos, Lucas Leiva, Hummels, Kyriakos Papadopoulos,
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