Pokemon GO: Second generation Pokemon officially confirmed for this week0
What's more, a lot of the first-gen Pokemon currently available will get new evolutions. We certainly hope that Eevee will have some more Eeveelutions available for gamers to discover and catch.
Alongside the new creatures, there will be some additions to the encounters gameplay. It appears that Pokemon will have some extra behaviors we haven't seen before, but Niantic failed to specify what exactly. The encounters UI will also be getting some love, with some new item carousels that allow you to choose Poke Balls and berries on-the-fly without opening any additional menus.
Last, but definitely not least, there will be new avatar customization options in the form of different hats, shirts, pants, and “other items”.
While this is not the trading/PvP update we've all been waiting for, it's certainly an exciting one. Especially with spring right around the corner, we'll have plenty of reasons to “get up and go”.
source: Niantic via Engadget