So, current game, the inevitable Angel I pop began its adventures, found a portal to Foxford, werewolf'd. Later killed Zarcaz and made him a werewolf, and at first I was excited, but it turns out werewolf Zarcaz is unable to gain promotions, only "forfeit promotion for level", which is sad.
It occurs to me that I gave him his own bow automatically, without checking to see if he already had it as a result of being werewolf'd - I have no idea if that's what would happen or if it's relevant.
Werewolf'd leashed units do not lose leash, I imagine this surprises nobody.
"Abandoned goblin" event can apparently trigger on nearby units rather then the killing unit - Valin took out a stack of like six or seven goblins, and the tiger in the city behind him ended up Orcish as a result. I think it also triggered from a werewolf'd bandit onto my Lizardman, but my Lizardman was already an Orc so I'm not sure.
I am getting a lot of mileage out of that event, by the way. Trying to trigger it on my werewolf angel so I can make him a vampire werewolf orc, which I feel very strongly should also be a win condition. It's like Sphener's fall, but instead of a desire to enforce justice and law, "Starwolf" just watched Underworld while playing WH40K for like a thousand years until he went insane and the OO showed him the path.
If I could only Drown him on top of it for an aquatic zombie werewolf vampire orc...
People have pointed out the frequency of the event, but I think the issue is actually the frequency of GOBLINS which can trigger it. I tend to hit it five-ten times a game now, but I chew through well over a hundred goblins by turn 200 or so on average as well.