According to the anonymous source, Wii U will use three-core ‘Espresso’ CPU and DirectX 10.1 compatible AMD Radeon GPU. As for connectivity, Wii U comes with WiFi and four USB 2.0 ports. Additional features include Full HD output, cable support for HDMI, Wii D-Terminal, Wii Component Video, Wii RGB, Wii S-Video Stereo AV and Wii AV. As for storage space, Wii U should come with 8GB of internal storage space, but it will also feature a SD card slot, so you can easily expand the storage space if you want.
So far, these are just leaked information, and they haven’t been confirmed by Nintendo, however, Nintendo is planning an announcement that should take place this week, and might get some information from officials, so stay tuned for more information.