Isn't a 4.2M growth YoY a bit too much? I mean, it's doable, but Sony would have to do great pricing throughout the whole year and I don't see them doing that.
Actually, if Sony drops the price early enough and has good holiday deals it could do even better. Second year sales are almost always higher than the first year and sometimes to a significant degree. Not to mention this year they have a lot more exclusives compared to 2014 and several of which are much bigger deals than any first party game the PS4 has so far.