The last time it was speculated like this in a minor version, I don't remember what it was, I think it took about two weeks from the articles and videos saying it was on the way until it was released. I think the same thing will happen with this one, and I think the week starting April 17 is a good in-between time to launch it between 16.4 and 16.5.
However, the errors that they say that it solves make me doubt whether it can really be launched, because the weather app works, what fails are the servers. The wifi, although it is true that one night I was disconnected, I don't know why, it has not failed anymore, so I put it as an occasional problem and not an error itself.