One of Inbox by Gmail's best features (aside from a silly name) is the ability to "snooze" emails until later. Now that feature is getting better for emails that include a date or time, like restaurant reservations, flights, or hotel confirmations.
The new feature will allow you to snooze until more relevant times like an hour before a reservation or the day before an event. It should appear for a number of scenarios including reservations, hotels, flights and even package tracking. This should help remove some Inbox clutter, as you no longer need to pin emails for events that won't happen for weeks.
Inbox by Gmail: Snooze to just the right time [Gmail Blog]