It's because this time it is officially called "Wii"
The full name of the other consoles can be seen in the EA release about Need for Speed.
Xbox 360® video game and entertainment system.
PLAYSTATION®3 computer entertainment system
PlayStation®2 computer entertainment system.
PSP® (PlayStation® Portable) handheld entertainment system.
Nintendo DS™.
and Wii™
The full names of Nintendo's old systems have always had "Nintendo" in them (not sure about Famicom though)
Nintendo Entertainment System
Nintendo GameCube
Nintendo64
The Wii is just called "Wii"








