Nope.
No exclamation point, no change in appearance, it is just in the list like the others.
I understand about the USB not needing a restart, and as such, the device appears and disappears correctly when you unplug it and replug it in.
But still the keyboard and mouse do not work ... I am a little bit at a loss, I would do a reinstall of the driver but oddly I cannot find it on Dell's site. I found the one for the on-screen indicator but not for the device itself.