As of December 1st, MSI will include Eidos' Tomb Raider Underworld game with its R4800, N280GTX, N260GTX and N9800GTX+ series of graphics cards. While all other partners are bundling the same games, MSI decided to differentiate itself by adding the Tomb Raider: Underworld to the list. 

Eidos' Tomb Raider: Underworld is a great game that received high praise all around the net, including the "Editors' Choice" award at IGN.com. This bundle will be included with N280GTX OC HydroGen, N280GTX-T2D1G-OC and N260GTX-T2D896-OC cards in the N200GTX series, three cards in the N9800GTX+ series as well as R4870X2-T2D2G-OC, R4870-T2D1G-OC and R4870-T2D512-OC cards in MSI's R4800 series.

As you can see from the list of the cards, MSI's new bundle can be considered a gift to those that decide to buy MSI OC series card. You can find more information here.