Quoted from KingPinGames:
The 75th Anniversary Edition was originally going to be limited to 1500 units. After some discussion that was removed (shortly after the machine was released) and it will be a production machine for as long as people continue to purchase it. The next run of Wizard of Oz pinball machines will be towards the end of the 1st 2019. These are the facts, from me, a distributor. This is according to the last update I received from JJP on 11/14/18.
That's a total bullshit move on their part, 1500 isn't really limited to begin with but taking that limit off is a kick to people who bought RRs early. If true they've lost me as a future customer for any kind of special or LE package.