According to Bandai Namco, this is “due to final adjustments in the game.”
In a statement, Slightly Mad Studios boss Ian Bell said, “Moving a release date was not an easy decision to make, as we know our fans are eager to get their hands-on on Project Cars. But we know that these extra days will allow us to provide the best game experience that our fans deserve. We assure you the wait will be worth it when the game does arrive early April.”
A Wii U version of Project Cars is also planned, but has not been dated.