When it comes to new hardware, Nintendo always keeps quite on technical specifications and that hasn't changed with the Wii U. The main focus for Nintendo has been to promote the controller and how the company will once again change gaming. Console specifications can also be interesting though and many hoped the Wii U would outperform current-gen consoles.
Though it's not been confirmed by Nintendo, an analyst from Sterne Agee may have proved the console is more powerful. Speaking to a number of different developers at E3, Arvind Bhatia revealed that some stated the console is 50% more powerful than the Xbox 360 and PlayStation 3.