Pick the year you want
Route is variable, but there are only so many tracks to pick from. Don't expect an MTB ride and you won't be disappointed, if you expect lots of technical singletrack your looking in the wrong place.
CCCC one of the organising clubs does hold weekly rides, but the routes probably won't tie in with much of the honc route, bit too far for the average saturday morning. Plus different ride leaders have different ideas about where to go*
I don't know about Winchcombe CC, the other organising club, and any rides they organise.
If you want to risk coming up and seeing what the Cotswolds can offer feel free.
As for when the entries open i haven't heard anything mentioned on the club pages yet, probably first week next year????? I very much doubt Grahamh et al have actually started to decide a route. Beyond tea and cakes at Guiting Power.
* another discussion, not appropriate to discuss here but those who know me know my opinion.