I would be really shocked if we see any news of the next X anytime soon. To be honest, the "real" roll out of this phone is just getting started. With it being on all carriers, national ads, cyber deals, holiday deals, etc. The phone is hitting its stride. To leak or let anything out about the next X would just be counter productive at the point. They should "leak" information when the sales on this phone flat line.
It seems they are going to roll out more backs for this phone. Now is really not the time to be thinking about the next X. Although, I have said from the start, we all love this phone now, but I really believe the next phone will be their real flagship device. This phone is just a test to build their brand.