Let's approach this from the point of view Blizzard has espoused in the past (whether or not it is liked):
If there is a major change like this coming, they announce it in advance. They
know players don't like to be surprised. (To be fair, some do. Most, however, do not.) They've announced major changes already for talent changes, tier set art, raid bosses, etc.
Is it theoretically possible they could sneak in a surprise announcement now? Sure. Is it likely? Almost certainly not. But, why?
Logistics. I'm boiling all of what comes down after this into the one word: logistics. It is not feasible for them to get a brand new spec up to par in the short period they have available before 10.1 launches. Yes, 10.0.7 is coming out next week. They're already working on 10.1. They're not done with what they have already announced: Both talent reworks and tier set bonuses.