Halo 4 will be receving three new DLC packs next month, which can be bought individually or as part of the Champions Bundle. While one pack contains two new maps and gametype, the other two offer... erm... new armour sets.
The Bullseye pack adds two new multiplayer maps, one of which is a remake of Halo 2 map The Pit. You'll also get a new grav/Grifball variant called 'Ricochet' and a suitably sporty set of Spartan Armour to wear. It'll set you back 480 Microsoft Points.
The Infinity Armour and Steel Skin DLC packs both cost 240 Microsoft Points, and predictably contain a selection of new Spartan Armour suits to wear.
All three DLC packs are dated for August 20th, and can be purchased for 800 MSP all told via the Champions Bundle (a 160 MSP saving if you genuinely want all the content).