Wii U Firmware Update 4.0.0 LIVE NOW!

Wii U firmware update 4.0.0 is now live. Reports are conflicting on the size of the update, but most agree it's around 600-700MB.  So far we know that the system update does these things:

• USB Keyboard
• Wii Off TV Play
• Surround Sound support for Wii games (Dolby Pro Logic II)
• Access Friend’s List from Wii U menu directly
• Upload screens taken when pausing the game directly to blogs and forums using the browser.
• Option to receive automatically downloaded software from Nintendo.
• Wii U Chat via headset connected to the Game Pad
• View PDFs on the Browser.

Source: http://www.nintendo.co.jp/wiiu/support/system_update/index.html