This image is an exciting one for many players. Remember that fruit-bearing tree from earlier? Well, it's been confirmed that Berry-growing is now re-implemented in the Pokemon series. You can plant and grow your very own berries, and harvest them yourself.
The story behind this image, according to the leaker, is that a certain NPC gives you control of a huge Berry farm, and lets you use it to plant/grow berries. As you can see in the bottom right, berries fall off of trees onto the ground, and the player has to manually walk over to them to pick them up, making for a fun little minigame.
It's unknown whether this is the only place to grow berries or if there are others.