Don't count on it, especially with how Microsoft doesn't have the lead. It took them almost 5 years to come with the Slim last gen, and that was more to move away from the launch platform and RRoD as well as to bring in WiFi. The Xbox One is a solid workhorse so far, much quieter and runs cooler. Would be smarter to keep the same size profile, come out with greater hdd sizes and newer cooler paint schemes. This gen won't go on as long either, so who knows.
It's crazy to me, a local EBGames told me not to expect any Elite controllers in Stock until at least Christmas. That's just such a missed opportunity to catch all the Halo 5, Black Ops 3 and Battlefront buyers.