steeldragons
Steeliest of the dragons
We know "Noble, Pub Crawler & Commoner" are 5e Themes, doesn't seem balanced nor likely that Barbarian or Ranger would be a themes.
I believe we know "Noble, Pub Crawler and Commoner" will be Backgrounds...not Themes. They will offer Skills (I believe, generally speaking, that means non-combat options/abilities). Whereas Themes will contain "feats", possibly with some skills also, but (again, generally) things geared toward combat use.
So barbarian and ranger could be utilized as Themes. Though I, personally, think barbarian is more suited for a background....ranger too in the "skills/non-combat sense". Tracking, Herbalism/Herbalist healing, Foraging and Animal Husbandry could all be skills under a "ranger/hunter" or "barbarian/tribesman" Background. With, then, things like "Berserker, Archer, Ambush Skirmisher" as Themes with combat-oriented abilities/bonuses.
That said, I think we will see Ranger as a Class, but the buzz seems to be hinting that Barbarian will be achieved through the "Fighter" class with certain BGs and Themes.
At least, that is my understanding from what we've seen thus far. It is, certainly, subject to change this early on.
--SD