I see what you mean now, yes that would be cool.
Some kind of current sensor (current flowing sensor) should not be too hard to add in that case however it might not be very accurate.
The challenge with this type of device is finding an off the shelf case with the mains pins ready to plug or solder into a PCB.
An afterthought is that you can do this today in a different way:
Go to home depot and buy a standard 2 plug electrical box and plug socket with cover. Inside you can place a SwitchMote2x10A PSU including Moteino for wireless control. The input can be a standard cord to the supply plug. The output is wired/screwed to the two input plugs. Then you have 2 controllable plugs. Not super aesthetic but I guess you could mount this in the wall directly too.
And if you get a double size box, the face plate of the SwitchMote with 3 buttons and status LEDs could mount into that other slot. So that way you can control them locally also. Very doable
Would look like this, two buttons could control the plugs, the other would be general purpose: