Yes, there are rumors about Apple's plan for the iPhone in 2017. Ming-Chi Kuo, the well-known financial analyst at KGI Securities, claims Apple will revamp the lineup next year, including an AMOLED display and a new design.
According to Kuo, Apple in 2017 will release a new iPhone with glass casing and an AMOLED display. This somewhat contradicts an earlier note from the analyst that said Apple was aiming for an AMOLED iPhone by 2018. More specifically, Kuo believes that Apple will decide between glass, plastic, and ceramic casing for its 2017 iPhone, but that the company will ultimately settle on glass, much like the iPhone 4, "as plastic doesn't offer thin and light form factor designs, and it would be not easy to precisely control the tolerance of ceramic.
Kuo also states that the 2017 iPhone models will have a curved display and a curved glass body on the front and back, with metal sides. He also states the case design will be different with more narrow bezels and that Apple will release a bigger 5.8-inch version:
Despite the larger display, however, the device will feature a form factor that is ultimately smaller than the current 5.5-inch iPhone. If Apple is able to produce enough of the 5.8-inch AMOLED displays, the larger device will entirely replace the 5.5-inch model, meaning that Apple will offer 4.7-inch and 5.8-inch iPhones in 2017.
Finally, Kuo says the 2017 iPhone lineup will support wireless charging and some kind of biometric hardware options.
This could make iPhone 7 an unprecedented second "tock" in Apple's typical "tick tock" schedule. Intel is doing something similar with Broadwell, Skylake, and Kaby Lake, so it could simply represent the realities of new technology readiness in an increasingly mature market.
Keep in mind that the 2017 iPhone lineup is well into the future, so take Kuo's statements with a big grain of salt.