Heathen!Only one animal companion? When I think of a beastmaster, I think of the classic movie - The Beastmaster. He had two ferrets, a tiger, and a hawk (or eagle or something). Minor cosmetic changes were made in later movies, such as making the tiger a lion. But I digress.
I hope they have a paragon path in there that represents this archetype. I know, I know, it's all about the Balance. Still, there's something to be said about archetypes.
Two Ferrets, an Eagle and a black Tiger. Later movies changed the eagle to a Bald Eagle and the Black Tiger to a regular one.
And the first movie rocks. Very Dark Sun-esque.
I hope Martial Power offers a multiclass option for other classes to get beast companions.