A new report indicates the launch of the next generation Prius has been delayed because a Toyota executive didn't like the original design.

A new report indicates the launch of the next generation Prius has been delayed because a Toyota executive didn't like the original design.

The all-new Prius was originally scheduled to enter production in the spring of 2015 but now it's programmed to reach the assembly line approximately a year from now. The significant delay has to do with an unexpected redesign after Toyota's global research & development chief Mitsuhisa Kato was not satisfied with the work of chief engineer Koji Toyoshima.

Aside from the design issue, Kato mentioned other problems led to the delay but he refused to go into details. However, several months ago we heard Toyota decided to push back the launch until December 2015 to make sure all chassis and body issues are fixed.

Codenamed 690A, the new Prius will use microchips and microcontrollers tested in the TS040 HYBRID and will likely be available with both nickel-metal hydride and lithium-ion batteries, with the latter being more expensive and providing a higher range. Toyota powertrain boss Koei Saga previously stated the possibility of an optional all-wheel drive system while the thermal efficiency of the gasoline engine will be increased from 38.5 percent to more than 40 percent.

The 2016 Prius will ride on the Toyota New Global Architecture (TNGA) and is expected to lose about 20 percent of its weight and adopt a lower center of gravity while fuel economy will be boosted between 8 to 10 percent.

A full reveal will likely occur in the first half of 2015, with production slated to kick off in Japan before the year's end.

Next-gen Toyota Prius launch pushed back until late 2015 due to design problem