According to Niantic, the Appraisal feature basically lets players determine which Pokemon might be more worth it to feed candy to. “Trainers will now be able to learn about a Pokémon’s attack and defense capabilities from their Team Leader (Candela, Blanche or Spark) to determine which of their Pokémon have the most potential for battle.”
This means that instead of just randomly giving candy to your Pokemon, this will help players better determine which of their Pokemon might have more to gain from the candy. Unfortunately this update did not bring about features like trading or battle outside of gyms, but as Niantic states, they are still working on bringing those features to the game, so stay tuned.
In the meantime, recent stats have revealed that Pokemon GO could be on the decline, although we’re thinking that perhaps it’s more like normalizing the numbers, but either way fresh few features will no doubt be welcome all the same.