They both work fine, depending on how you meant to structure the sentence. "We'll all be eating rabbit" and "We'll all be eating rabbits" have slightly differe

They both work fine, depending on how you meant to structure the sentence. "We'll all be eating rabbit" and "We'll all be eating rabbits" have slightly different connotations (generic term for the meat vs specific animals) but mean effectively the same thing. The former seems to be the more common usage, as it's more analogous to "We'll all be eating beef" instead of "We'll all be eating cows".