Update: I contacted Cooler Master, they responded pretty quick via Facebook.
Me: "Hi, I bought the new Seidon liquid cooling unit a couple days ago, there is an audible high pitched whine coming from it. Is that typical? I intend on replacing it either way...
Cooler Master: "Our first patch has issues with the pump. We've since updated it. Please RMA it. We're sure you'll be satisfied with the replacement."
Again, I'll let you guys know what is going on. I suggest holding off on these til we get to the bottom of this.