Vendetta is reporting that the bout has been agreed to verbally. The winner should get a place in line for a title shot, probably! Since 186 is a PPV expect a title fight to headline.
The UFC is looking at November for the Melbourne show so Lombo could fight in Montreal and then again in Melbourne. Best case Ontario for him would be to beat MacDonald in Montreal and get a title shot in Austalia (his second home).
DFW didn't sound thrilled about this at the post fight press conference @ 182...probably isn't too thrilled about both fighters agreeing to fight over Twitter, either.