Just did my gold roll, pulled a greater siberys cake from it - nice pull, I'm sure it'll come in handy. Then I noticed that it wouldn't stack with the couple I already had in my inventory for emergencies.
So I examined it more closely.
The text of the cakes I already had reads: "Once the cake is eaten, the person is imbued with the power to return someone to life"
The text of the new one I recieved from the roll just now reads: "Once the cake is eaten, the person is imbued with the power to return a group of people to life along with any of their hirelings who are nearby (everyone must be within about 15 meters of the target)."
So it looks like mass true resurrection is a thing that's in-game now. Or might be in-game now. I don't want to use it & potentially waste it yet for the sake of testing.