Brad's right--no more Chip & Dale.
You'll probably see Mickey, Goofy, Minnie, Pluto, and Donald. Chip & Dale were there last year, but they're not regulars any longer. The CM told me that when I made ADRs a couple of months ago, and people on these boards have reported the change as well.
Food is typical Disney buffet stuff. Of the 3 buffets we went to last year (CP and Boma being the others), CMs was the least good, but it's the first one my kids all requested we return to. It's fun.