Isn't it 3/3?
Technically there have been 4 releases; the Update 1 before PB. Either way, some pretty spot 100% dates with the randomness the releases have been.
I agree there are just a bunch here with the personality of a basement dweller who equally think commenting "first" on every Youtube video is "cool." I imagine it with their little creepy giggle.
No one has any info or methodology, period. Just random guessing; even a broken clock is right twice a day. The only person will some semblance of insider info seems to be the "reddit guy."