Could be. It's something that's been noticed for a long time but even with the Beta no new information for or against has come up. I'm of the opinion that there at least was a connection between the two races. Recall the five races image where a Hive looking figure is displaying the Fallen tendency of losing its soul through its head. I think either the two races were very connected in the past and Bungie has made them a bit more distinct as Destiny matured or they are very connected to each other even now but Bungie has kept that plot point largely hidden from us.

I'm torn on this... I think it's a possibly interesting idea, but then again I don't know how much I want to see Bungie trod the familiar grounds of "potent enemy taken over by parasitic space zombie"

I could certainly lean towards that theory of the Hive and the Fallen--if related--faced an evolutionary split countless years ago. If the Fallen were at one time the receivers of the Traveler's light, then the darkness could have been the catalyst for the "corruption" that turned some of the Fallen into what we know as the Hive.

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While it is an interesting observation, it would be unwise to put too much into it for now. This is one of the ways conspiracies start after all, where one thing is very much like something else and is therefore considered a de facto relation.

These two things have 2 (two!) similarities - they must be the same.