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Sunday 15 April 2018 at 07:01
Pretty sure the timeline put out in the release was Pros first, LEs next in May, then Premiums. I don't remember the capacity at the new location (100 games/week maybe?) I would expect the premiums to come out early June. That is just my beer math though.
Source: http://pinside.com/pinball/forum/topic/when-will-we-see-iron-maiden-premium-and-le#post-4339915