So, today's Nikenme Radio was more interesting than I expected. I went to go do something halfway through and came back to a chat full of congratulations. I tuned back in not even a minute after the reveal itself, but the gist is that
ZUN and his wife are expecting a second child. Unfortunately I couldn't record the stream because livestreamer is bunk so I couldn't double-check, but judging by various tweets here and there congratulating him, I'm fairly confident this is the case, and we'll see more on this in the future.
Here's a copy of the chat at the relevant time:
http://pastebin.com/jNvJyHT3Congratulations, jokes about "releasing a new work", and a question about whether ZUN wants many kids, to which ZUN replied "two or maybe three" (after which he started talking about reasons some families have many kids and why some don't).
Additional post on Touhou Memory
Also a funny tidbit, was this:
ZUN: [About Q&As] I'd sure like a question that really wakes me up... stop asking me stuff like "are you going to port the PC-98 games" already lol
you heard it here folks stop asking
As noted in the following tweet, this came from him saying that he prefers answering questions that are about what he's
thinking, rather than what he's
doing. So asking "are you gonna do this bla bla" is less engaging, whereas asking about his thoughts or opinions are more satisfying. I think most people acquainted with ZUN's interviews would agree that these kinds of questions tend to have better answers.