It would appear that this update is laying down foundations for quite a few significant changes to the game, including genders for monsters, Pokémon costumes and shiny variants. It also contains sound files for the next 100 monsters - which should be coming soon.
Tweaks have been made to the "nearby" tracking feature, and there's a new "buddy" position: baby. This adds weight to recent rumours that you'll be able to breed Pokémon in the game soon.
Finally, it would seem that we'll be able to customise our avatars a little more in the near future, which will come as a relief to those tired of the fact that there's not much scope for individuality in the game at present.
You can read more details on these changes here, but in the meantime, let us know what you think of these discoveries by posting a comment.