Planning on playing a massive amount of Halo 4 multiplayer? You could actually earn yourself Microsoft points for doing so if you take part in the Combat Tour Offer Microsoft is currently touting.
Put in 35 hours of Halo multiplayer and you'll earn yourself 100 Microsoft Points. Put in over 140 hours and you'll get yourself 600. That's half a Mark of the Ninja!
It looks like Microsoft is seriously, seriously investing in making Halo 4 a success across the boards, and seems intent on making Halo 4 the game to play on Xbox LIVE.