What are we expecting for Universal's expanded virtual line program?
Is it going be like an app version of the Volcano Bay system where each ride has a ~15 min (socially distanced) physical line and anything above that gets added into a virtual queue? Or is it going to be more like boarding groups or specific reserved times like FastPass?
This is 100% guesswork, but my expectation would be virtual queues will be used for attractions that do not have facilities conducive to the social distance queuing that's been proposed. Luckily, Universal tends to overbuild their extended queues and will finally get some use out of them, so it's quite possible the list will be short. Of the top of my head, the virtual line candidates might include...
Rockit (limited queue space pre-metal detectors and a poorly ventilated primary queueing area; can't have too big of a backup for those checks, especially with the claustrophobic locker situation)
Hulk (see Rockit)
Escape from Gringotts (locker situation)
Forbidden Journey (locker situation)
Hagrid's (poorly ventilated caves + demand)
One Fish Two Fish (maybe... just not a lot of queue space)
Pteranodon Flyers (queue space)
Escape From New York (preexisting)
Fast & Furious (probably doesn't need it at all, but the infrastructure's already there...)
Revenge of the Mummy and Men in Black probably have some sort of queue to enter the locker area (though spacing for that could get tricky, especially for MIB). If that proves infeasible, add them to the list, I guess.
Everything else can probably operate with the socially distanced queues.