The 5.12-rc6 kernel prepatch is out for
testing. “Well, if rc5 was bigger than usual, and I worried about what that
meant for this release, rc6 is positively tiny.

So I think it was just due to the usual random timing fluctuations,
probably mainly networking updates (which were in rc5, but not in
rc6). Which means that unless things change in the next two weeks, the
schedule for this release is going to be the usual one.“

Source: LWN.net – Kernel prepatch 5.12-rc6