What’s different about Arsenal’s new-look 4-3-3 system?

Arsene Wenger has traded the 4-4-2 with the 4-3-3 for the new season in order to reinvigorate his side but what is different about the new system?
______________________________________________________________________________

The problem facing Chris Barnard, the first surgeon to successfully perform a human-to-human heart transplant was rejection whether the patient's body would accept the new organ.