Uhhhhh... Okay
10.4 did look like a general rollout (like 2017.50.3, and that was for Ho Ho Ho). I would say so far, it's hard to say for 2018.12, as it's only been four days (being charitable), and if they are on a new 'guaranteed a release every two weeks' cycle from Karpathy, then, nothing may be 'full speed release', who knows.
We may in fact be on a dependable full release rolling cycle, where those on the early end are the start of the 'lump in the snake' and those at the end of the lump get it as we get 2018.14. We'll have to see if that's a new pattern.