Just a couple of random thoughts. First, I am actually kind of glad we are getting the Ring base, since I haven't collected any of the LSB busts prior to Gandalf, so I like the consistency. Second, I wonder if the change has anything to do with the fact that these are smaller in scale. One thing I think some people may not have noticed about the Wiki bust is that the height listed on the product page is 15 inches, but I'm fairly certain that includes the crown. That should make him about the same scale as Gandalf, and I would bet that the Ringwraith will be the same. That is much smaller than the scale of the other LOTR LSBs.
In any case, I like the base design, and I don't have a problem with what some call the genie effect (I don't really see it that way anyway), and I'm looking forward to this one quite a bit.