Well, I'm sorry to be a complainer here.
For me, this is just about the most disappointing character choice possible after a seven month gap. They follow up the ringwraith with another ringwraith? If they weren't going to give us hobbits and wanted to do a villain, they should have done Saruman or a Moria orc or Lurtz or anything that brings a little variety to the line. Having back to back ringwraiths in a line that is this small and slowly paced is a frustrating choice. 25% of the line is now ringwraiths. I would have preferred anything to this. It just seems lazy and repetitive and it's even worse knowing that all the other character possibilities have now been pushed back for months so we can get a cameo/variant version of the last piece released. Now that we have two Witch Kings, is it time for a new Aragorn yet?
There are way too many main characters missing to have two ringwraiths in a line of only eight pieces. I'm sure some people will be happy to get this, but it should have come much later, in my opinion. I really wish they had done Saruman if they wanted another villain at this point. There was a place for this kind of character choice in the SS/W line, because of the faster pace and greater number of pieces overall. If they are going to make us wait over seven months for a new announcement, I'd like to see more variety--and if the line is going to move this slowly, they need to focus on getting the main characters done.