Thought this might be worth a topic post as it's a very recent development.
From the "News" section of the Coopculture website:
https://www.coopculture.it/en/the-colosseum.cfm
We inform you that on 8 and 9 April the visit path to the Colosseum
Belvedere will be not accessible due to maintenance work.​From 10 April 2019 to 31 May 2019 visiting of the fourth and fifth
orders will not be allowed."
Visitors who have booked the Panoramic/Belvedere tour are being emailed regarding cancellation and refund. As near as I've been able to see, combo tours which were to include the Underground, Belvedere and arena are not cancelled but will not include the Belvedere, and refunds being offered for the cancelled part of that tour. I'm trying to get more info on that as I'm working from secondhand info here so if anyone knows for SURE what the refund situation is....
Anyway, if any of you booked a Belvedere/Panoramic tour to occur between now until May 31st, expect a cancellation notice if you haven't already received one.