I imagine he'll make a big deal about his "transition" to himself in the last week of his show on Comedy Central. I think it's interesting that the big spots are now Fallon, Colbert, and Stewart with some Arsenio Hall, Seth Myers, and John Oliver. It really is a new era.
I don't know. Would he drop the character that made him successful in the first place? He already has a successful talk show and a lot of leverage. I suspect he negotiated a lot of freedom, though I can't be sure how far he'll go with it.
I would assume so. Playing an oblivious conservative doesn't have anything to do with the Late Show. But it will be so strange to see him be himself instead of play his character. I almost don't know how I feel about it!