MotoGP: Jorge Lorenzo's Ducati switch poses tricky questions

Story highlights

  • Jorge Lorenzo due to leave Movistar Yamaha for Ducati
  • Rift between Lorenzo and Valentio Rossi may have prompted move

(CNN)As MotoGP arrives in its Spanish heartland for this weekend's Jerez Grand Prix, one topic dominates conversation on the circuit -- world champion Jorge Lorenzo is leaving the blue of Movistar Yamaha for the red of Ducati next season.