I don't think there will be a huge overhaul, but I see a few potential moves.
First, the dead weight. Riikola and Pettersson will be traded for whatever can come back, likely draft picks, maybe a marginal prospect or two.
Second, I think they're going to surprise at the expansion draft and protect Crosby, Malkin, Guentzel, Kapanen, Carter, Blueger, Tanev, Letang, Dumoulin and Matheson.
I could see them using Rust to try to grab a goalie in a trade. Seattle would then pick between McCann, Zucker and Jarry in the expansion draft.
Then the Pens turn around and trade the remaining two not taken by Seattle prior to or during the draft a couple days later.
You'd be left with:
Guentzel-Crosby-XXX
XXX-Malkin-Kapanen
XXX-Carter-XXX
XXX-Blueger-Tanev
Dumoulin-Letang
Matheson-XXX
Joseph-Marino
Goalie Trade
DeSmith
You'd have the money to re-sign ZAR if you want, but also the space to add a bigger defenseman and add at forward, all while keeping the core and some key components together.