For starters, the loot hasn't changed much. We've still got an Android Lollipop-like background for the initial graphic, which now looks like a frontal of a marshmallow-headed bugdroid, and even the mini-game available if you long press it is similar. It's still a Flappy Bird clone, but this time the obstacles are giant marshmallow heads on sticks.
If you get Android Marshmallow on your device and would like to check it out for yourself — and even waste a few hours trying to get your high score to 3 — you should head over to About > Tap on Android version several times. You'll see the same thing shown in slide #1 in the gallery below, and would need to tap on the Marshmallow logo several times followed by a long press to enter the mini-game.