The Emery County portion isn't good for mechanized travel (including bikes). When they say "worked on for 20 years" it means that the proponents of Wilderness got their whole original wish list over the compromises that had occurred up until now. Last time this was given public attention was 2008, when the current RMP was put in place (the last trail and road inventory of which I'm aware) and last time these changes were advanced (and rejected) was 2017's Red Rock Wilderness Act.
Magically six Wilderness Study Areas of roughly 450,000 acres became 14 Wilderness with 660,000 acres instead.
WSAs north of I-70 are currently Sids Mountain and Mexican Mountain
But the new Wilderness are Sids Mountain, Mexican Mountain, Cold Wash and an expanded Devils Canyon
WSAs south of I-70 are San Rafael Reef, Devils Canyon, Muddy Creek, Crack Canyon
But the new Wilderness are Devils Canyon, San Rafael Reef, Muddy Creek, Crack Canyon, Reds Canyon, Horse Valley, Little Wild Canyon, Middle Horse Valley, Big Horse Mesa, Rhino Head and Little Ocean Draw
It required a land swap and approval of the County commissioners, who gave a one day hearing notice and listened to nonsense about 75 miles of primitive roads they claimed were already closed, a few of which (between McKay Flat and Temple Mountain) I can tell you as recently as January 2019 were still mapped, signed on the ground and recently traveled by others besides me.
Nope, those are to apparently be closed without public comment or new inventory and travel plans. At least one really good MTB single track (the Waterfall) I know of will be lost and all the current dispersed camping in the south and east of the San Rafael Swell over to UT24 appears to be eliminated or absorbed into a larger Goblin Valley State Park. All the OHV and camping will be concentrated into the middle San Rafael Swell Recreation Area with presumably a handful of the current improved roads and perhaps a few nationally known trails cherry stemmed in (Devils Racetrack, Blue/Green/Orange/Red trail, 5 Miles of Hell, etc).
Not sure if the current mapping is correct to protect a route that exists connecting Behind the Reef to Hidden Splendor, which is currently connectable using bikes, motorcycles or narrow ATVs. The 2008 RMP has a few broken sections there but hasn't been updated AFAIK.
Oh, and grazing wasn't disallowed. So those roads will still exist and any current gates will get locks I guess.