I've had the new dock up for a little over 8 hours at work. I haven't run across any charging issues when the screen is detached and re-attached.
I did hear the device disconnect and re-connect chime a few times throughout the day but my keyboard and mouse were still working fine. However, I did take the keyboard and mouse out and connected directly to the laptop to see if the chimes stopped. The chimes stopped.
I have everything plugged into the back of the dock. Mouse, Keyboard, (2) Mini display port adapters, and a network patch cable.