Four games is still the limit for regular season games (and still retaining a redshirt). And the post-season games still do not count against the 4-game threshold.
Luke Reynolds, Cooper Cousins, and Dejuan Lane are well past the 4-game threshold. So we'll continue to see them.
Quinton Martin is at 3 games. He probably would have gone past the threshold, except he's been out with an injury. Projecting his future use is pretty dependent upon his health, as well as the health of the starting RBs
Vaboue Toure and Max Granville are at 2 games. I suspect both will see action in two of the upcoming games.
Tyseer Denmark, Kenny Woseley, Anthony Speca, Jaylen Harvey, Xavier Gilliam, Eagan Boyer, Jon Mitchell, and Antoine Belgrave-Shorter have all played in 1 game. I suspect that most of them will see some action in some number (up to 3) of the upcoming games.
Lastly, Corey Smith, Ethan Grunkemeyer, Liam Andrews, Garrett Sexton, Malachi Williams, Donovan Harbour, Josiah Brown, T.A. Cunningham, Caleb Brewer, Kari Jackson, Peter Gonzalez, and DeAndre Cook have yet to play in a game. Andrews and Gonzalez are injured, so it's questionable if they'll see any time in the upcoming games. I think Brown is also injured, but I'm not certain about that. If he is, then I question if we'll see him. Reports are good about Grunk. But there are other QBs with more experience on the roster that are also chomping to get playing time, so I question if we'll see him. Granville is a exception, as is Cousins, but in general OL and DL prospects need a year (or more) to work on their technique, while also building up their bodies, so I'd be somewhat surprised if Sexton, Williams, Harbour, Cunningham, or Cook see much (if any) time. Perhaps with Beamon departing the team this week, Cunningham will get some time; I'm not sure.
Outside of the 3 that have exceeded the threshold, I'm not sure if we'll see much (if any) of the others listed above against Washington. After that, PSU has games against (in order), Purdue, Minnesota, and Maryland. The Purdue game, and the Maryland game, seem like situations where many of the aforementioned (excluding injured, OL/DL, and Grunk) will see action. They may also see action against Minny; probably depends on how PSU does in the 1st half of that game.