Eamon talked about set stages for the raid version back in May. But at that time I think he was looking at the option of providing sleep / shelter controls for the raid version as well as the 320km a day version. I believe he's now back tracked on that for the raid version. I suspect, but it's not yet confirmed, that you'll need to keep ahead of the intermediate control close times, but you can do that in different ways.
One rider may decide on a 265km first day, followed by 215km next day. Another rider may end up with a 250km first day, followed by a 230km second day. They are both averaging the min 240km a day, but doing it in different ways. Where you can reasonably get accommodation will dictate much of the raid riders plans unless some take a bivvy or basic camping gear. If you are going to allow more riders you'll need this flexibility of where they can stop overnight lest accomodation gets full.
I've had confirmation that they are looking to start the raid version at 9am on the Thu. More civilised than the 6am start the "classic" version had in 2016.
This week, I'm helping out Eamon with the GPX tracks for the event. So I'd expect once we've sorted those out, the route and sleep control locations (for the classic version) will be made public by the organising team. The raid version will follow the same route, which will be mandatory, but you will not be tied to overnight stops other than min times as above, and some of the mandatory controls.
In terms of controls it was receipt , info or photo evidence , manned camper van , or manned sleep / shelter controls. There were also secret controls where Eamon and Seamus jumped out a van. Plus of course there will be live satellite tracking of each rider.