Hey guys I have been playing Halo 4 since the beginning of this year.Today I decided to buy the Champions Bundle for 10 bucks.Armor and Weapon Skins all like I expected. But I have some problems with Ricochet and the new maps. I cant find them.Is there a DLC Matchmaking list or something I am missing. I played some Richochet in the Team Action list but it was random and in 10 games I only played it once. I really like this mode and am very sad that i cant play him in a different list. Furthermore I cant find Vertigo and Pitfall in which list can I play these two. I hope somebody can help 
The Ricochet game type no longer has its own playlist, like you said it is now found only in Action Sack. As for the new maps, they have been integrated into the playlists of appropriate sized teams (mainly 4v4 game types). There is no DLC only playlist. In order for the maps to show, everybody in the game lobby MUST HAVE the DLC. If a single person in the lobby doesn’t own the DLC, then they wont show as voting options. A problem with this is that the majority of the people who still play Halo 4 either dont’ have or just plain refuse to buy any DLC. So your chances of playing on the maps in online multiplayer are very slim due to the low number of DLC owners. If you want a chance to play on the maps you bought, i suggest looking here to see which playlists they are in and hope you get matched with other DLC owners.
Thats a bit sad but thanks for the quick reply buddy