It'll probably be as good, and sell similarly to Star Wars Kinect. A core franchise making a Kinect spin off. It's possibly got lower sales potential though because Fable is unknown outside of the core gaming Xbox/PC crowd whereas Star Wars has mass awareness among the Mums and Dads looking to buy a gaming machine for their kids.
Still despite this woeful PR attempt I imagine about 1/4-1/3 of fable fans will get it, and people who really dig Kinect will get it because it's a reasonable entry in the Kinect stable, so that should mean it makes a profit.
“The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.” - Bertrand Russell
"When the power of love overcomes the love of power, the world will know peace."
Jimi Hendrix
