Rovio teasing a new bird on the way or just screwing with us more?

While we get closer to finding out what it is that Rovio is teasing us with these days from pictures and a video which, although smacks of a new Halloween Seasons update (which is truly what we think it is), or a new game in general, Rovio seems to what to mess with our minds a bit more with hints of possibly a new bird?

Found on their Facebook page is a cropped picture of the ass end of a yellow bird. Whether this is a new bird heading our way, possibly making a debut in the upcoming Halloween update (or other version of Angry Birds update), or just Rovio screwing with us and feeling the need to show us the same Yellow bird's ass for some reason.

What does make it seem more feasible that this is a new bird is the fact that the current yellow bird is more triangular in shape. This happens to be much more rounded like the original red bird. So what does everyone think? New bird heading our way or Rovio just playing a joke on us. It is almost Halloween so it could be the trick before the treat.

Developer Website: Rovio

Website Referenced: PocketGamer