Well, if Patch 5 is bigger than patch 4, then yes it will be "the biggest patch so far". :P I'm definitely hoping for more of the missing classes to be added.
I don't think it will be bigger, because after 3 months we got one class. I think that again in 3 months we will get 1 class or maybe a new 1 new companion. Or we'll get an update in the summer.
