Robert-Jan Broer did say in an interview before the ST2 that it wasn't their intention to make a yearly Speedy Tuesday release and it would be as and when.
I'm just waiting for 2020 when I hope they do a remake of this 1970 Alaska prototype, my ultimate Speedmaster(in fact make that my ultimate watch)...
If they do it I pray to God they change nothing about it, that for me is perfection! I've hinted to RJB whenever possible.