score:5
These changes have not yet come into effect because OFAC (the Office of Foreign Asset Controls) has yet to publish new regulations.
Further, OFAC has said its new regulations will still permit travel that was at least partially booked before the President's announcement if said travel would have been valid under the old regulations.
I suggest you finalize your arrangements before the new regulations are published, as it appears you may not be able to complete any bookings after this date.
See Question 5 at Frequently Asked Questions on President Trumpβs Cuba Announcement published by the US Treasury.
5. How do the changes announced by the President on June 16, 2017 affect individual people-to-people travelers who have already begun making their travel arrangements (such as purchasing flights, hotels, or rental cars)?
The announced changes do not take effect until OFAC issues new regulations. Provided that the traveler has already completed at least one travel-related transaction (such as purchasing a flight or reserving accommodation) prior to the Presidentβs announcement on June 16, 2017, all additional travel-related transactions for that trip would also be authorized, including if the trip occurs after OFAC issues new regulations, provided the travel-related transactions are consistent with OFACβs regulations as of June 16, 2017. Once the State Department publishes its list of entities and subentities with which direct transactions will not be authorized and OFAC issues its regulations, no new transactions may be initiated with these identified entities and subentities. Prior travel arrangements that may involve these entities or subentities will still be authorized. See FAQ 8.
The US Treasury is responsible for the Office of Foreign Asset Controls so I would regard this information as authoritative.