From the previews:
Tiberion - Few warbeasts survive long enough to distinguish themselves in the service of the skorne, but the fiercely intelligent and disciplined Tiberion has fought alongside Tyrant Xerxis for over a decade. Because the titan’s intractable nature made him almost impossible to train, his original handlers nearly put him to death. Xerxis sensed an extraordinary fighting spirit in him, though, and took it upon himself to break the beast. Now Tiberion serves his master Xerxis with all the devotion of a sworn soldier, standing immovable against waves of enemies even as he shatters entire formations with his powerful tetsubo.
Sons of Bragg - The Sons of Bragg swagger across western Immoren like living legends, each mighty with both sword and voice. The Sons are heard long before their arrival, booming mighty chants that resound off trees and mountains. Wrathar leads the chorus of his brothers Tor and Rhudd. Their voices join in perfect harmony to belt out powerful chants that sustain them despite impossibly grievous wounds. On their own each brother is formidable, but together they are an army of three.
Storm Troll - Unlike the many varieties of trolls that prefer to blend into their environments, a storm troll primed with galvanic energy and ready to attack is a blazing beacon of power, intimidating well beyond its size. Deadly lightning erupts from the array of natural conductors that runs the length of its spine, playing along its sides before bolting from its mouth at anything that arouses the troll’s ire.