The Nintendo Network is set to debut later this year and will greatly expand the online functionality of the two consoles, allowing gamers to purchase downloadable content for Nintendo titles or even buy digital copies of full games.
Fans of the recent 3DS title Mario Kart 7 will be pleased to learn that its popular Communities feature - which lets users set their own multiplayer rules and invite others to join their group - will be an integral part of Nintendo Network.
Meanwhile, the Wii U will introduce a personal account system for the first time on a Nintendo console, meaning multiple users will be able to create different profiles on the same system.
The news will help to further bolster the popularity of Nintendo 3DS, which has sold more than 15 million units since its March 2011 launch.
Meanwhile, Wii U - which features a revolutionary tablet-style touchscreen controller - is set to be released across the world before the end of 2012.