Did a quick check via previous orders:
Oddworld Stranger's Wrath Bundle and the Runner 2 Bundle, each with the PAX variant, went on sale an a Friday together with the typical releases.
The only exception (I could find) was the Ys Origin PAX variant, it was sold stand-alone on a Monday. I think they mentioned it in the thread a couple of days before it went on sale.
edit: Shadow Warrior was also on a Monday, Absolver on a Wednesday.
Interesting. Ok, I'll just have to follow around then (and hopefully someome will update in here before it hits)