First off, you'll be able to choose from two new snooze times when you want to put certain things off for a while - "later this week" and "this weekend". These have apparently been highly requested through the Inbox feedback process, and they should decrease the use of custom-set snooze times.
Finally, you can now choose what your "weekend" days actually are, similarly to how you can set your preferred morning time to receive emails. This is easy and straightforward to set up, as you can see in the second screenshot above, and should work well with the custom snooze time of "this weekend" of course. It's also clearly going to be extremely useful for those who live in places where the weekend isn't made up of Saturday and Sunday.