Logitech just came out with another multi-device bluetooth keyboard, K480. They added a groove for your phone and tablet. On the product video, they have an Android phone next to an iPad on the groove.
It certainly seems compelling for someone who owns multiple devices. I own the K811 and it also does the same thing as the K480 but without the groove plus it has illuminated keys.
I’m not sure if this is something that I would replace my K811 keyboard. I don’t switch devices on the fly that often to type. Another thing that I noticed is that the white keyboard is all white with grey while the black has a lime/yellow color for the groove and switch. I would have gone black with silver.