I strongly suspect that the timing of this change is not random. Android Marshmallow will probably feature it. Their design article even show how google now a

I strongly suspect that the timing of this change is not random. Android Marshmallow will probably feature it. Their design article even show how google now and voice search are supposed to look on mobile with the new logo. The change has gone very smoothly on the web, but yes I am pretty sure that in some dark corners of their least used properties, there are some forgotten logos.