I'd say that Sora will have made a new one. Considering Mickey states that the 6 known wielders are Sora, Riku, Himself, Terra, Aqua, Ven. and then considering the end Lea. Guess this means that Kairi ain't a wielder.
I'm thinking that ven and terra are the ones left off of the list. That leaves room for kairi and lea given the present circumstances. Honestly, I feel that terra will be the last one saved if anything.