If Barca & Inter win their respective qtf, they will meet in the semis. If you're saying there will be El Classico IV at Wembley, then I have to agree with you. It will be a mouth watering finale.
No, Barca, Shaktar, Real and Spurs are in the same side of the draw.
Chelsea, Man Utd, Inter and Schalke are in the other side.
It has already been pre-determined.
Hence a Real v Barca final is impossible. One of them will be eliminated in the SF if they make it through the QF.