Earlier today Microsoft announced that they will be delaying this month's security updates due to finding a last-minute issue that could "impact some customers." This may be due to a glitch in their new process that they were not able to iron out in time for today's planned release.
We will be keeping an eye out for any updates and will, as always, provide timely coverage for the security vulnerabilities once they become public. There is no word yet of when that might be.