Niantic announced a new feature for Pokémon GO adding Daily Bonuses to encourage players to login and play the game daily.

More bonuses, more fun! Daily bonuses are coming...

Trainers, We want to provide you a detailed look at a new feature coming soon to Pokémon GO - Daily bonuses! Trainers will soon be able to receive a bonus for certain daily activities, including catching a Pokémon or visiting a PokéStop once a day. You’ll earn a larger bonus if you do this seven days in a row!

Catching a Pokémon every day will earn the following bonus:

• 500 XP
• 600 Stardust

Catching a Pokémon every day for 7 days straight will earn the following larger bonus:

• 2,000 XP
• 2,400 Stardust

Visiting a PokéStop and spinning the Photo Disc every day will earn the following bonus:

• 500 XP
• A number of additional items

Visiting a PokéStop every day for 7 days straight will earn the following larger bonus:

• 2,000 XP
• A greater number of additional items

If you catch a Pokémon at any time on Tuesday local time, you’ll be eligible for the next daily bonus on Wednesday at 12 AM local time.

Source: http://pokemongo.nianticlabs.com/en/post/daily-bonus/