Pricing will be announced shortly, Mazda spokesman Jeremy Barnes told Edmunds.
The car received an extensive update in 2015.
A new steering wheel is borrowed from the 2016 Mazda CX-9, and a heated steering wheel is a new option. Gauges are easier to read, and a new interior package features Nappa leather.
Also new for 2017 are heated rear seats in Grand Touring models equipped with the Premium package.
The updated Mazda 6 also adopts G-Vectoring Control, which is being introduced on the 2017 Mazda 3.
The technology improves steering responsiveness through the precise control of engine torque.
Safety updates include a new camera for the Smart City Brake Support system that expands the operating speed range for detecting pedestrians. A traffic-sign recognition system automatically recognizes road signs and alerts the driver to their presence.
All 2017 Mazda 6 sedans are equipped with a 184-horsepower, 2.5-liter four-cylinder engine linked to either a six-speed manual transmission or a six-speed automatic transmission.
Edmunds says: Mazda fine-tunes the 2017 Mazda 6 in the hopes that buyers will pick it out of a crowded field of competitors.