Daily guaranteed Pokémon encounters
Trainers are now getting a special visit from Professor Willow! He’ll tell you that he’s been working on a special kind of Incense. This Incense won’t appear in your Item Bag, but it’ll be active after Professor Willow gives it to you, attracting a Pokémon once a day that’ll appear only for you. Be sure to check the game every day to see what Pokémon will appear!
Daily Free Boxes in the shop
Trainers are now able to receive a free box of items daily in the shop! The Shop button displays a notification when a Daily Free Box is available. To get your Daily Free Box, simply go to the shop and claim the box in the Free section. The box will contain different items each time, so be sure to claim your Daily Free Box every day to see what items you get!
Source: Official Pokémon GO blog