I haven't seen it pop yet (perhaps I missed it the first time?). I'll check again tomorrow morning.
Do you see other pop up messages in the game?

There are two separate login bonuses. The first is the cumulative daily bonus and once per day the first time you log in you should now see an overlay that shows you your prize. Each day you log in without missing a day the prize gets bigger. If you miss a day it will be reset back to the beginning. This will only happen once per day if you log in multiple times. The second rewards you for total number of days played and will only show up once you hit a milestone.

Currently the way a day is calculated is the first time you logged in after the update plus 24 hours, so everyone's day is different at this time. If this ends up being confusing for players I can change it so a new day starts at the same time the server resets and everyone would be on the same schedule.

Good luck in the Pit!

-Nate-