Reports are that it patches a vulnerability that is being actively exploited so if they are not offering it through WU I suspect that this patch comes with some 'gotchas' that make it problematic for general release. Maybe beta test it for a few days and then offer it up on WU for later this week?
I meant features of 18362.10019. Finally. Btw which kb number was 1909 enablement package? I want to create an image using ntlite.
If it comes on WU, then there is no doubt that it is offered to the public. Otherwise, it is a only niche patch which should not be installed without good reason. Certainly the MDL members are a special category which can hardly be called "the public".