There was a Twitter post about it being released early.
First post "Typical Amazon algorithms, not on my watch list, not on my front page, had to really look to find it.
Response on Twitter was "So it was a Massive Hunt to find it?"
This has then been followed up by numerous other people "moaning" about the same thing.
People just do not like to think, even slightly outside the box these days - OK, lame little joke - making it not appear on the front page (for all I know, it now does because of the numerous moans).