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Unicron will apparently not have a number he will also not be released under a subline banner like Siege or Armageddon but will be released in similar styled generations packaging.
Many international fans are upset about the US only release. Not to kill the momentum but it's sounding like they're going to do a cheaper general release of the figure in maybe less fancy packaging, but they don't want to say it yet because then everyone will sit on the fence and wait and not pledge to the unicron backer stuff.