Will the Wii U controller be for hardcore gamers?

[thetonestarr]

If by "hardcore gamer" you mean "people who stick to one or maybe two genres (like maybe FPS) and just play everything within that/those genres to death", then no, it won't.

But if you mean actual hardcore gamers, in the connotation that the term was originally coined, then yes, it most certainly will. It'll be able to play everything that all other controllers can, but also have a whole new range of possibilities too, allowing for a much more complex and immersive experience.