They do give dates. For that particular title it was 10/15. Another example of a game that came and went was Red Dead Redemption 2 (March to Sept). Typically you get about 6 months for games on temporary rotation. On that one they warned in August about a month ahead.
Limited Selection. You can find the list here: https://www.amazon.com/l/17934980011
Mostly game gift cards PS Store, Xbox, Nintendo etc and Amazon devices like Ring and Echo. Some cellphones headsets and SSDs too.