As for healing, it will definitely be different from Werewolf healing. Currently, the best healing that dragons have access to costs 2 WP to give them basic wolf healing for a scene. And that's a 4 dot auxiliary. We'll probably make Hydra healing more potent than Zaltys healing, at the cost of only being able to use it on themselves.
Defense against firearms isn't something we've considered much, since dragons are archetypically more about withstanding the damage than avoiding it. Though there is already a Hide of Iron auxiliary (Kevlar Skin) that gives their armor a ballistic rating, and one of the Hydra auxiliaries could be to make all firearms and similar damage bashing. (like vampires)
As for healing rapidly, it will be fairly different from Werewolf healing.