Straight to video I believe, so it is already available. It's exactly what you would expect from the trailer, except that the sidekick (actually a "Gun Caddie") is more awesome than they showed.
However, I am now in love with the chick that plays Mary Death (Christian Pitre). GOT DAMN is she fucking hot. This is her first movie of any significance, so hopefully she ends up in a lot more in the future.
I've watched a lot worse movies in my day, so if you don't mind cheesy Road Warrior ripoffs with some decent humor, decent gore, a minor role by Gary Busey, and a smoking hot babe...then this is the movie for you.
EDIT: Even better clip of Mary Death.