Axel wrote: B. , do you know if at entrance south there was/is an extra queue for the S+C pre access? If so, what do you think, when should one queue there based on last year's experience?
I don't have any insight on how it will be organised this year but last year was the first time with the Silent & Clean pre-booking (well actually they did something similar a few years before)
and also that they already gave you the temporary wristband when you entered the queue (and not when the gates opened at 16:00).
This resulted in a very long line outside of the waiting area as the ticket check happened at the queue entry.
For S&C there was an additional wait after the 16:00 opening at the entrance of J camping itself.
I suspect, since there will be a separate, queue at South for S&C pre-booking, they will give you the temp wristband and the wristband for S&C pre-access at the waiting area already and at 16:00 you can move straight in without any more additional queueing.
So taking into account that there probably will be a line again to get into the waiting areas, I would say try to be there at 13:00-14:00 at the latest.