not to mention that it makes sense that servants( werewolves ) would stand up to their oppressors
Sure, but it's still not something that became popular in recent times until Underworld. Plus, werewolves in TES were never servants of vampires.
Both " forced " transformations and " willing " transformations have been recorded for werewolves, or wolf transformations through out time.
Here on Earth, but not in TES. Other than when having Hircine's Ring, Skyrim's Companions are the first depiction of werewolves that don't have forced transformations and a need to kill, and it's strongly implied because it was a pact with the Glenmoril Witches. And even then, the Companions still become "like wild beasts" when transformed.
And how did you come up with this conclusion?
The fact that there was no werewolf content shown, and there's nothing to say there will be werewolf content in it. An off-handed Dev comment that merely implies more werewolf content sometime in the future does not mean Dawnguard will have anything. Maybe it'll have a small something, but there's nothing yet to indicate that.
Werewolves and Vampires walk hand in hand
Just like in vanilla Morrowind and Oblivion. Morrowind had vampires from the get-go, and it took a handful of DLC and
two expansions before werewolves showed up, and when they did, they didn't interact with vampires at all. In fact, the lycanthropy it had was not designed to be used passed the expansion's MQ and back on Vvardenfell. Oblivion had vampires from the start, and
never got werewolves.
Skyrim is the first TES game that had werewolves at the start since Daggerfall, over 15 years ago. And in both cases, there were no direct interactions between them except for the odd quest (in Daggerfall there's a vampire quest where you need to clear out a dungeon that a pack of werewolves had moved into, and in Skyrim one of the radiant quests for the Companions may send you to a cave with vampires in it; that's all).