floyd mayweather is set to take on manny pacquiao on may 2 .
pacquiao 's promoter bob arum says contracts have n't been signed .
arum says the draft he received is different from the agreed terms .
tickets for the fight at mgm grand have yet to go on sale .
mayweather vs pacquiao : wbc unveil $ 1m emerald green belt .
mayweather ` is a control freak ' , says pacquiao 's promoter .