Dataminers are constantly looking for new tidbits in Pokemon GO's source code to get hints of what's coming up. It appears they've discovered yet another tease of something to come. We just don't know when it will be implemented.
New quests for the Mythical Pokemon Jirachi have been discovered hiding in the game, and they were only recently discovered. No specific details have been shared on these quests, but it's likely they'll be implemented into gameplay somewhat soon.
On top of that, two new moves were added. The moves include the Fairy-type Fast Move Charm. Seeing as how there's no Fairy-type Fast move in the game, Charm being added could be a big deal.
Finally, it appears that the next loading screen will change based on the time of day. A different color scheme will be used depending on what time you're playing.