Toyota Motor Corp. plans to unveil a redesigned Camry in Detroit next month, rolling out a new take on the best-selling car in the U.S. after just three years as Asian automakers defend their turf in the shrinking market for midsize sedans.

Automakers usually wait about six years between major model changes. The current Camry design is dominated by a straight line that slopes forward between the body panels and windows, all the way from back to front. In contrast, internet spy photos of the upcoming 2018 Camry show shoulder-like curves beneath the back window, and a hood that plunges toward a grille that stretches almost all the way across the car.

"For years, we've had a reputation for high-quality, durable products that were perhaps somewhat conservative in design," said Bob Carter, head of sales for the Toyota and Lexus brands in the U.S. "We're looking to hold that position, and to add to it emotional design and fun-to-drive characteristics. "