It's a possibility. It really depends how you interpret these things. You can conceive of gravity as being a curvature in spacetime, but you can also just as well conceive of it as a field. Mathematically, they're the same. So if you do the whole quantization thing to that field, you get gravitons. That said, we don't know how quantized gravity works (when you quantize gravity you run into some pretty big issues), so it is possible that the answer will involve no gravitons, but I'd say that's unlikely at this point.