No plans for now, and here's why.
Measuring power is a hard thing to do right, but it's very easy to just get a "ball park". If you want to get an accurate sense of what a circuit is consuming, you should measure it as close to the source as possible (ie in your panel). Otherwise you are only measuring the device draw (which in most cases is sufficient) but the power loss in the circuit wiring are not accounted for. The AC voltage drop is significant in residential circuits.
The SwitchMote PSU is basically the PSU side of the SwitchMote and it's there to provide power and switching capability. Measuring power would mean this would no longer be a through hole product and would very significantly increase complexity/size and cost. Plus you have devices like KillAWatt that are really cheap and can be
hacked to transmit power readings via Moteino.
I hope this explanation puts into perspective why bundling that functionality in SwitchMote is not really ideal.
To me measuring circuits in the panel is a much more interesting problem.