Liars:

April 2013:

“What we´re going to make sure is that the Wii U version is not the worst

one, it won´t be a crappy version. We want people to get the game and

say `Holy s***, that looks amazing!´”

SOURCE: http://www.nintendolife.com/news/2013/04/project_cars_dev_making_sure_wii_u_doesnt_get_a_crappy_version

December 2013:

“The Wii U is more than capable of providing the core Project CARS

experience. Sure, some super-high-level graphical effects may not be

possible but in comparison it also offers a unique interaction

experience via the GamePad controller, with the second screen

potentially becoming your track map overview, rear-view mirror,

telemetry, or simply mimicking a real race car steering wheel whilst you

use the gyroscope to drive.”

SOURCE:

http://www.nintendolife.com/news/2013/12/wii_u_more_than_capable_of_providing_the_core_project_cars_experience_says_developer

September 2014 :

“Tudor
said he sees the game regularly and he’s impressed with where it’s at.
“It’s got dynamic time of day, weather–it looks phenomenal,” he said.
“And the actual console itself is quite good.”

“”It’s
not our job to disappoint those guys,” he added. “So when we say the
Wii U version is delayed in 2015 because we need a little more time,
that’s all it is. We just want to make sure it’s of the same standard of
all the other games. To do that, we just need a little more time.”
“There is no conspiracy.”

SOURCE: http://www.gamespot.com/articles/project-cars-wii-u-delay-theres-no-conspiracy-dev-/1100-6422143/