Nintendo has pushed a new software update for the Wii U bringing a slew of new features such as being able to play Wii games on the GamePad,  Dolby Pro Logic II surround output, USB keyboard support, etc.

Also in the pipeline is a similar image sharing tool that for the Japanese 3DS which will allow games to share screenshots on Facebook, Tumblr and Twitter.   No word on an international release sadly :/

The official changelog for 4.0.0 U firmware is as follows:

New Features:

• A feature to output video and sound to the Wii U GamePad when using Wii Mode¹
  • Users can choose to output to the TV and GamePad, or just the TV
• A feature to automatically receive recommended software and demo titles from Nintendo using SpotPass
• Support for USB keyboards
• An option to disable use of a Nintendo Network ID on non-Nintendo hardware, such as PCs and smartphones
• Support for Dolby® Pro Logic® II Surround Sound when playing Wii software

Changes to Wii U Menu:

• Added a friend list icon to the Wii U Menu for easier access to the Friend List

Changes to System Settings:

• An option to automatically receive recommended software is now available under “Internet”
• A setting to select which cable outputs sound is available through “TV”
  • Users can choose to output sound through an HDMI cable, non-HDMI cable, or both cables at the same time. Click here for instructions
• A setting to adjust the hourly interval in which standby functions are performed is available under “Power Settings” when Standby Functions are enabled

Changes to Wii U Chat:

• Added the option to view a friend’s profile on Miiverse when sending or receiving a chat request
• Users can now chat using a headset connected to the Wii U GamePad

Changes to Internet Browser:

• Pressing the R or L Buttons on the Wii U GamePad will skip video playback forward/back a small amount of time
• Holding the R Button will speed up video playback
• Ability to save username and passwords for websites that require login²
• Ability to launch the Internet Browser during gameplay and upload screenshots
• Added support for viewing PDF files³
• Added features intended for website developers that allow the user to enable developer tools and set user agent

Improvements to system stability and usability:

• Further improvements to overall system stability and other minor adjustments have been made to enhance the user experience