Google Inbox's snooze functionality is losing a couple of options. Specifically, the 'Pick Place' and 'Someday' options are being retired. The confirmation regarding this came from Top Contributor at official Google forums.
The Someday option was for cases where-in you wanted to get back to emails and/or reminders, but not sure when. The Pick Place option, on the other hand, reminded about emails at certain locations.
The Top Contributor says these options are being retired likely because of low usage, and users can send feedback to the Inbox team (from within the app) to let the team know they still need these features.