In the first Gotrek and Felix novel, Trollslayer, (I think the mini-story is called Ulric's Children), there is a story over the Children of Ulric, who take the form of Wolves, and this girls daughter, who Felix is captured alongside, is the child of one these. Her father slays a Tzeentchian Cultist Sorceror, who then takes the form of the Wolf-man, and nearly kills Felix, before, Gotrek rolls in.
Although she has human form, this Girl has a Wolfish "panting, laugh", and sharp, needle like teeth.
It's not clear whether she is a true Werewolf, but the fact that her father has the form of a Wolf-man, suggests that either by choice, or through time, she changes into one of these Children of Ulric. That's all I can remember, though from that, been a few months since I've read Trollslayer.
In the 6th Edition Hordes of Chaos, there is a story about a Norscan Trader/Bodyguard talking with an Empire Scholar, who tells of the Wulfen, which I assume is the Wolfish form of a Chaos Spawn. Because of their nature, I'd hazard a guess at saying they are unable to change back into human form.
The Vampire Counts Army Book, 7th Edition, there is an item called the Talisman of the Lycni, which increase the Movement of the Bearer, and Lycni is similar to Lycanthrope, which I think is the name for the either Werewolves, or just Were-creatures in general.
Lastly, there is a story of a Vampire who could turn himself into a Bat at will - it's not too hard to stretch that idea to a Wolf.
Hope that's okay.
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