I'm pretty sure it will be $50, just like any other game. As of now, the highest budget game I believe is Enter the Matrix, and it released for $50 (eventhough it sucked.) As for pricing on the Xbox 2 version, God only knows.

"Growing up my dad was like 'You have a great last name, Galifianakis. Galifianakis...begins with a gal...and ends with a kiss...' I'm like that's great dad, can we get it changed to 'Galifianafuck' please?" -- Zach Galifianakis