What @Stu says 
. AFAIK the ACEO devs don’t have a standard update day, on the experimental branch they continuously update the game with bug fixes, improvements and updates (which I like and appreciate very much and don’t see that often in the gaming market). They have a ‘standard’ day for the DevLog, maybe that is what you are referring to? The DevLog is aimed for every two weeks (so around twice a month) around the beginning of the week, last one was DevLog 112. Next one should logically be next week but as they have some time off it could be 3 weeks from now.
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