Some of the same stuff that has always been there.
"You should consult your private physician to determine whether you have a medical deficiency that would interfere with the safe performance of sport piloting duties"
"You should consult your private physician to determine whether you have a medical deficiency that would interfere with the safe performance of sport piloting duties. You may exercise sport pilot privileges provided you are in good health, your medical condition is under control, you adhere to your physician’s recommended treatment, and you feel satisfied that you are able to conduct safe flight operations. "
Given that a private physican is not likely to know all the ins and outs of an FAA third class medical certificate, the Federal Air Surgeon response does not seem to support the claim that if you can't get a third class medical you are automaticly disqualified from flying under the sport pilot rules.