Joystiq has reported that Electronic Arts has pulled the head-tracking feature out of its upcoming physics-based Wii game, Boom Blox. It wasn’t an important feature per say as it would only appear in an Easter Egg, it was just an interesting concept. No reason was given for the removal:

“Head-tracking was something we considered including as an Easter egg in BOOM BLOX however, we did not end up including it in the final version of the game. …”

Source: Joystiq