I don't know if this is definitive.
Who'll and who will are just a lazy W away from being the same thing. It could just be that you're used to hearing it spoken in a lazy way like... "Wha' do you mean" in place of "what", since a d and t are close.
Of course, you're from Vancouver so results inconclusive.
"Bordate is a pretty shady place, what with the gangs, casinos, evil corporations and water park." - FAHtastic