Confirmed: Business Platinum (USA) earning - 5x on prepaid hotel and flights
Just spoke with the business platinum team and they confirmed that as of 3/31 the business platinum card will match the personal platinum card and offer 5x the points on flights booked directly with the carrier and hotels.
This confirmed change finally compelled me to leave the business gold as my 3x category was in airfare - this will result in a huge increase in personal earning.
Great news!