One of the things that I noticed yesterday when I was doing my planning and the worst case scenario of riding on the minimum average speed based on 1640k divided by 125 hours, with the diversions added etc and slightly extra distance for some sections compared to the checkpoint closing times for my start time that I got an email for, there was about 3 checkpoints that I would arrive at after they had closed..
Whether the brevet cards have been altered to reflect such, I don't know but at this late stage, I'm not replanning and still basimg the ride on 125 hours and have an extra buffer zone of 3 hours 20 minutes.