Here Jeb posted a picture of food changes:
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It appears as if there will be multiple ways to prepare food now.
Or, if I had to take a wild guess... (given that there's a "Hunger Bar" in that screenshot)
pink - basic meat.
white - salted? (would mean a new resource - salt biome? - I was thinking about Minecraft when I looked at this - built in a salt mine.

red - rancid meat? would poison the player. Or, a partially cooked pork (i.e., the player hastily cooked a piece of meat. Not sure how waiting 2 more seconds can kill you, unless you're face to face with a creeper).
brown - cooked.