are you stuck with the 5.2 when it arrives?? if no and you like the 5.0 and it fits you and you want it - then I'd go for it. But then - I'm an instant gratification kinda gal - I don't even go multiple places on the rare occasion I shop for shoes! 
PS: have you tried calling Trek to confirm or deny the story?
Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, champagne in one hand, strawberries in the other, body thoroughly used up, totally worn out and screaming: "Yeah Baby! What a Ride!"