St George of England: I doubt the GB will end up in prison.
It is a civil suit, as far as I can tell. Prison isn't an option.
New York recently amended a law that extends the period in which abuse victims can sue their attackers before the statute of limitations expires. The plaintiff in this case is able to file suit, and has added the WTS and GB (and the congregation where the abuser attended) as defendants. The plaintiff is claiming that an elder in her congregation was abusing her (and other children) and the WTS/GB must have known that this was going on but did nothing about it.
I don't know if someone can take the 5th during a deposition (I don't see why not, as the 5th Amendment allows a person to avoid answering a question if it may incriminate them). In this case, taking the 5th might hurt the WTS/GB, since it gives the impression that they have something to hide. But if they don't lose the case, will anyone notice?
My guess is that this case will be settled before any individuals are deposed. The WTS doesn't want the GB members (or any JW, especially an elder) being deposed about policy or past abuse cases. It can come back to haunt them. They will settle, then claim that they only did so to avoid the high costs of litigation. And the rank and file will see this as another money grab from an evil, angry apostate serving Satan's purposes.