From the releases:
Oberwald’s qualities are those of the classic Blood Bowl hero. He’s tall, superfit and strong, with a grace and co-ordination that can leave most other players standing. Instantly recognisable across a murky Blood Bowl field by the splattering of gore across his kit, Oberwald cuts a very dashing figure and it’s no surprise the girls go wild when he has the ball in his capable hands.
When Skaven teams want to add a bit of punch to their line-up, the most popular option is to recruit a Rat Ogre. Created through an unholy combination of selective breeding, dark sorcery and warpstone-enhanced surgery, these monstrous brutes stand twice the height of their team-mates. Their crushing fists, razor-sharp fangs and single-minded devotion to slaughtering anything that isn't wearing their team's colours make them a real asset on the pitch. Coaches should be warned that training a rat ogre to pick up a ball is unlikely to go well, and indeed, getting one to do anything other than rip opposing players to shreds is always going to be a challenge. But then, that's what the rest of the team's for, right?