I'm not new here, but thanks for the welcome. Somehow I overlooked the Windows Central write-up when scanning the front page, which I thought was strange since they usually seem to have the most detailed write-ups regarding Microsoft news. That was my mistake, and I wouldn't have started this thread if I'd seen that first.
Anyway, the reason I asked about a speculative release date is that the Windows blog post doesn't say, but all the other articles I read were written as if the update was already available or with a sense of surprise/disappointment that there wasn't an update available when the writer checked this morning. Windows Central's article is the only one I've read that describes the update as being available "soon," which could indicate anything from today to a couple weeks from now.