That doesn't make any sense... In the trailer Herp the Warrior just becomes Herp the Dragoon, using a spear and all.....
And its not as simple as giving 1 or 2 enmity skills to a class and call it a tank. You need more skills, traits, some form of dmg mitigation, etc. Unless Yoshi makes some heavy changes on LNC I don't think it can become a tank. IMO anyway.