I'd like to post my thoughts on Ice Climbers and the reality of their situation, copying and pasting my thoughts from rate their chances on coming back:
I really used to think Ice Climbers were a shoo-in. Sure, they have all the merits to come back, they are Smash veterans, and the Polar Bear is in Smash Run too, there's still a big wall that can hinder their inclusion in the roster, technical difficulties and 3DS limitations. Since I'm not much a technical guy here, I'll just quote an important part made by @
Delzethin:
And for all we know, Polar Bears could be there because Sakurai did want the Ice Climber representation and them back in the game, but (hypothetically) in the middle of development while they were being worked on, they could have decided to cut Popo and Nana due to the technical problems, they would have probably been planned in a future patch later. You
can't use the Polar Bear as a supporting argument nor the franchise demoted argument when there's still the technical problem they have (Which I think would be more important than all the supporting arguments for Ice Climbers in terms of the development process).
And even though they could hypothetically give the Ice Climbers the solo Popo treatment, it completely gets rid of a unique concept and defeats the purpose as to why they were added in Melee in the first place, it's something I doubt Sakurai would plan to do.
The Ice Climbers overall don't have much of against other than limitations. I now think it can go either way, no matter how much I want them back. Like Delzethin said, the reality is that they are really anything
but guarenteed at this point.