I think a 2nd season pass could potentially bring a bunch of good things to Gears of War 3, but if they do it like they did the first one each DLC will be centered towards an aspect of the game (Campaign, Horde, Versus, ect.). I personally enjoy the campaign but after I play it once I normally never touch it afterwards. If we get Versus DLC it also contributes to Horde & Beast, so in the long run I think multiplayer maps are more entertaining.
My ideas for the "Final Map Pack" are that it will include every map ever released in Gears of War 1 & Gears of War 2 including the DLC, and it will cost the same amount as the first Season Pass. The pack could also include some aspects of the past games like Sires in Horde, Skorge as a multiplayer character, Some Classic Character Skins (Myrrah, Hoffman, ect), a Classic Horde mode, and maybe even the Classic Hammerburst from Gears 1 (I highly doubt it). New weapon skins would be a nice addition too my ideas are Rust, Ice, Kryll, and any will do really.
The Pack Could be called "Coalition's End".
What do you think?