I know this post is kind of late as this issue arose back in August when 343 decided they would cut my favourite playlist but Anniversary BTB was my favourite playlist. The maps were excellently designed and extremely fun to play. They had a decent enough population so there was no need to cut it from playlists. What was the point in introducing these maps if you wont let us play them 343? Are we that unimportant to you? Does it cost that much money to keep ONE PLAYLIST? Why was Anniversary BTB cut? WHAT IS THE POINT OF HAVING ONE ANNIVERSARY PLAYLIST, AT LEAST LEAVE A BTB OR TEAM SLAYER OPTION. If anybody else agrees with this please boost this post so that maybe, just maybe 343 will notice.
it really was awesome. most fun multiplayer halo i’ve played. arggg i miss ridgeline. 
Definetely.
As the guy above me said, Ridgeline was so much fun.
It was removed in the consolidation due to its redundancy with Big Team Battle already existing.
There won’t be any new playlists for Halo: Reach, just updates to gametypes & maps.
I don’t know why 343i abandon game that was released year ago (ok, I know, it has something to do with Halo 4…). I’ve heard that Halo is -Yoink!-'s the most important game series, but it would be strange if EA or Activision done something similar to Battlefield 3 or Modern Warfare 3. It seems, there are still lots of people playing Anniversary, game finds matches easly (faster than Halo 3 Social Slayer!), so they should do something with those playlists.
I know they won’t do a damn thing, but if it was up to me I would make Team Slayer and Big Team Slayer playlists (like they are in Halo 4, where you can play 8v8 matches without being disrupted by some objective bulsheet):
Beaver Creek, Damnation, Prisoner and (sometimes) Hang’em High in Team Slayer, Headlong, Timberland and (also sometimes) Hang’em High in Big Team Slayer.
There should be Classic Slayer (respawn with Plasma Pistol, instead of Magnum, just like it was in Halo CE), Magnum Slayer (same as Classic is right now) and Evolve Slayer (Reach TU Slayer on upgraded Anniversary maps, like it was after Halo Ann came out).
If they would let us play BTB again, I just hope they’ll cut everything that is not Team Slayer. They did it in Halo 4 and right now more people plays Big Team Slayer than standard Team Slayer.
It makes little sense to me to sell new maps and not support them with matchmaking.