We saw a picture yesterday that seemed to indicate the ability to use two Wii U GamePads when playing multiplayer games on the Wii U VC. Unfortunately, that doesn't seem to be the case. As it stands right now, the option only lets you pick which slot you what the GamePad assigned to. For example, Wiimote in slot 1 forces GamePad into slot 2. With that said, Nintendo could very well add in this ability when we get some dual-GamePad supported games.