Important announcement: Visa Exempt
It looks very likely the royal gazette will publish the change to visa exempt to 30 days as soon as Monday, August 31st.
This means if you are traveling from the 2nd half of September and are counting on 60 day visa exempt, you'd better apply for a tourist visa immediately so you still receive 60 days.
The new regulations also explicitly add that for land borders, you're only allowed 2 visa exempt entries per calendar year.
Keep an eye out for the news or the Facebook groups to make the final confirmation once it is published.
The order does explicitly state that it comes into effect 15 days after it is published in the Royal Gazette, so the grace period does look to be accurate.