The new look Wii console will lose GameCube compatibility, which prompted some to presume the console will be more compact, but Nintendo has revealed the console is exactly the same size as its predecessor.
The Nintendo website listed the box contents, and specifically states:
The newly configured Wii console retains the same physical dimensions as the original Wii console: Height 157mm, Width 44mm, Length 215.4 mm.
The Wii is pretty compact anyway, and at this stage in the machine's lifespan the process of designing and manufacturing smaller Wii consoles far outweighs any potential benefits.
The tweaked Wii is down for an October release across Europe.