I'd prefer a Mine Cart stage from DKCR or TF more than anything, but I'm worried that the Spirit Tracks stage already has that niche filled. Plus, barring the outside portion of the 'Crazy Cart' level being used, these wouldn't stick to the quota of one DK jungle stage per Smash game we've seen thus far. Tragic, really...maybe the Mine Cart Madness music will get in as a consolation prize?
Also, in regard to this new revelation about the 'request period' being over, I don't doubt that content from new games could work its way into Smash (probably on a case by case basis, depending on the game and how far it is into development). That said, what I'm taking away from this is: whatever was most requested during this 'request period,' which is open to interpretation but I'll wager was anywhere from early to mid-late 2012, is indicative of what we can expect to see.
Also, in regard to this new revelation about the 'request period' being over, I don't doubt that content from new games could work its way into Smash (probably on a case by case basis, depending on the game and how far it is into development). That said, what I'm taking away from this is: whatever was most requested during this 'request period,' which is open to interpretation but I'll wager was anywhere from early to mid-late 2012, is indicative of what we can expect to see.