One thing that distinguished the Orcs from other races is animosity as well as Brain Bursta, which resulted in the Orcs fighting among themselves or affecting Orc shamans when casting spells. Will this be implemented in the game?

From what I've seen, the unique flavor of each of the 4 races is achieved in the form of Race-specific command cards. We've seen "Fist of Mork" (which can do damage to friendly Orc units) and "Waaagh!" in the previews. We'll have to wait and see if there will be a card that touches on the "animosity" theme of Warhammer Orcs, perhaps a "high risk high reward" kind of card. I sure hope there will be something like this.

As of now, Orcs are the only race to really get relentless, allowing them to engage back lines of your troops. There isn't alot of infighting yet, but Impact isn't discretionary, so there is that. Future releases will tell.