I'm interested in this too, and also rather worried. My concern is Powerplay may not change what people are doing or more importantly offer them anything else to do. For example, Traders will continue to trade Gold between two locations for seemingly no economic reason. And Bounty Hunters will continue to go to mindless RES zones to help Wanteds commit suicide for no reason.
Worse still, Powerplay may simply orchestrate and reward this same old behaviour by now having communal graphs (leader boards) such that the Power/Faction with the CMDRs doing the most *grinding* gets the highest graphs so get some outcome in their favour.
I'm hoping Powerplay brings in some missions/gameplay elements that actually show/add some depth & interest, but from what I've read about it so far, I don't believe there will be -
https://forums.frontier.co.uk/showthread.php?t=140233
Hopefully I'm wrong and for example there will be far more interesting missions in V1.3...