Hortus (who works, I believe, in QA) has announced that the public test realms will be offline tomorrow between 12:00 PM PDT to 8:00 PM PDT for hardware maintenance. The fact that the realms are scheduled to come back online after Tuesday's regular maintenance window suggests that, yes, we're going another week without 1.12 being deployed on the live servers. Though I suppose that, while unlikely, it wouldn't be impossible for the PTRs to go offline running patch 1.12 and come back online running 1.13 - Blizzard does come out with surprises from time to time, but I'm not getting my hopes up. Drysc's message that "there are no current intentions to announce the release date of 1.12 beforehand" doesn't make me optimistic, either, though.
Update: My mistake, the PTR maintenance was Monday evening, not Tuesday evening. The overall point still holds, however.