Is GeForce Go 7900 MXM??

I'm looking at a new laptop with a GeForce Go 7900 card on it. I've heard about "MXM" and how it is able to allow you to upgrade some graphics cards in laptops. My main question is if this laptop has this card, does that mean it does have MXM? Next is what type of MXM is it (II or III) and will I be able to upgrade it to a mobile GeForce DX10 card when it comes out??