Wireless Charging Animation
Samsung should add some cool looking animation for the wireless charging, like the the borders of the screen light up with Green/Blue.
Different Charging Animations
Also, they should come up with different presets for different charging animations which could pair well with the wireless charging animation feature.
Standby Mode [AOD]
Finally, Samsung should incorporate a 'standby' mode feature when wirelessly charging in landscape mode (inspired from apple yes)