User blog comment:Arbington/New ME4 Teaser Pics, Possible Upcoming Reveal/@comment-89.241.230.229-20131109170356/@comment-1679409-20131109184445

I am beginning to believe that Bioware may have done a retcon here, certainly in regards to there being additional Citadel races. You would think we would have heard something about some of these other spacefaring races by now, certainly by ME3 when everyone is fighting for their survival as a species and banding together.

I agree that there could be additional undiscovered non-Citadel races out there, but I doubt there are any more truly spacefaring, undiscovered races left in the current cycle, at least those who have started colonizing. Considering how the other races are present in every region of the galaxy, you would think they would have run into other colonizing races by now. Look how soon humanity ran into the rest of the spacefaring races. I would also expect that any race that is using the relays extensively would eventually find their way to the Citadel just as other races have done and/or would have stumbled upon the colonies or homeworlds of other races by now.

Finally, I think the reason people want to see the raloi is because we've heard about them but have never seen them. That makes us curious. It's like how people wanted to see Tali's face.