I don't know about you all but look how fast the past year has gone by! Remember when we were all aching for EPVII to get here? It's already out of DVD! It'll be here before we know it! 
I actually think it's a smart move by Disney to not begin the marketing push yet. With one new Star Wars movie coming out every year for likely the next decade and beyond, it's wise to give the fans a break from advertisements until about three months before each new film premieres. Lest we be fed a constant stream of Star Wars promotions--film premieres, dvd launches, video game launches, casting announcements, and then teasers and trailers for the next film in the queue. As much as I adore Star Wars, that would be Star Wars overload. It would get stale after a while. Too much of a good thing is a bad thing, and all that.
No, I think they're handling it properly. Let the dust settle from the TFA box office juggernaut, and begin ramping up promotions for Rogue One after Labor Day. Ninety days is plenty of time to stoke interest in the first standalone film. If anything, a break in promotions will help casual fans understand that Rogue One is a new movie. Whereas a constant stream of Star Wars stuff from one end of the calendar to the other, would cause them to tune out.
The Wook
Much better with the wings facing back. Love it.
Ben