Stealth flanking and bombing tactics are prevalent in pvp (usually paired with timed proximity detonation for organised guilds).

We are working on a wolf pack, but the high cost of ultimate makes it hard to coordinate a 6+ group transformation.

I think it's possible, though I worry about effectiveness. It is difficult to gather that much ultimate on all those people. One issue would be how they can't roll and now users would head straight for them with poison arrows. Perhaps it's work better with some non werewolves healing and some archers to give the werewolves time to get to a target group and rip them to shreds. It'd be fun and it could be a great tool. Another tactic I've heard of lately is using the giant mountain in the northeast of cyrodil to gather a large group of people to attack ebonheart castles. It'd make a great base of operations. Though this tactic is better suited to Aldmeri and daggerfall, I guess ebonheart could use it too

I'll look into it, but I'd rather theorize in this discussion. Less time to watch, more creative ideas from a wider range of people, etc. sometimes the best ideas are made by people who aren't veteran rank 5 and leader of a 500 person guild.