I read somewhere that Werewolves get two other roars in addition to the fear roar you start with but need to he unlocked. Any validity to this? Also on UESP they reckon Vampires get Dread Cloak power, I have a vampire (stage 4) and it does not seem to exist. Can anyone shed some light on this please?

Vampire's get "Embrace of Shadows" power which gives invisibilty.

The other werewolf powers are gained by doing Aela's quests, one which will randomize to Hircine's totems. You find the totems and you get new werewolf abilities like summoning two spirit wolves to fight for you and the other to detect prey.

I can't help but vampires, but to unlock the additional werewolf powers, ask Aela for work once the main quest is over. She'll mainly give you Animal Extermination jobs, but there's a three-part quest chain (The Totems of Hircine) that will occasionally pop up in their place.

Thanks for your help guys!

No problem. Anytime!