They did announce it, even if it wasn’t in the way you prefer. Unless they’ve officially said somewhere else that that wasn’t the case, there’s no reason to think that their announcement wasn’t true just because they didn’t come here to make it.
Diablo 3 season 29 is also supposed to come out in May and they haven’t put it on the PTR or mentioned it much at all yet. I’m sure things are a bit rushed trying to get those things out before June when most of the Diablo team is focused on D4 (including the coms team, which I don’t think is very large).
edit: oh I guess they already announced it here as well