Confirmed. What I've noticed so far is that none of them are less than an hour, so I suspect that all they are doing is announcing the raid coming up, giving one hour pre-warning before the two hour raid window opens. Saw tier 1 and 2 (pink) and 3 (yellow) raids, so that looks to be the same. Next question is are they the same mon, or have they shifted?
Not a bad thing, all in all.