Harkon Lukas is a wolfwere, not a werewolf (big difference).
Fortunately for D&D they are all but the same now, not that I am any fan of 4e lycanthropy. And in previous additions any casual observer would call Lukas and his spawn werewolves.
Does he turn into a wolf? Yes. Into a man? Yes. Into a man/wolf hybrid? Yep. Did some game designer needlessly complicate the issue? Yep.
There was a spanish rock song by "La Unión" called "Lobo-Hombre en Paris", based on a short story by a french writer (whose name I don't recall)
The tale was about a wolf bitten by a man ("A Wizard of Siam" on the song) during a full moon, which cursed it with Lycanthropy. And then the wolf in the shape of a man, prowled the alleys of Paris...
I always assumed that wolfweres had been originally inspired by that short story...