So far there have been two teaser images released by the Heroes of the Storm Twitter feed. The first showed only dinosaur-like footprints leading to...well, nothing. The second shows a tunnel with what appears to be a spiked spine sticking out in the upper left corner. Combined with the original Arena image released some time ago, you can see a fallen arm under Morales' foot.

Finally, the original image was first teased on the StarCraft Facebook page, which pretty much gaurentees it's Dahaka. What do we know about this new Hero? Well, he honestly looks terrible. I loathe his design and everything about that. Fortunately his backstory is pretty good and he has some skills in StarCraft that I can definitely see be used in Heroes of the Storm. Here's his Bio from the official Wiki.

Dehaka lost his large right arm prior to the Swarm's return to Zerus; it was later to be found in the same area where Sarah Kerrigan defeated the other primal pack leaders.

When the Zerg Swarm returned to Zerus, Dehaka initially opted to simply observe the Swarm and Kerrigan. He witnessed the newcomers awaken Zurvan and the primal-infestation of Kerrigan.

Dehaka perceived Kerrigan as the strongest zerg. He and his pack welcomed the new power by allying with the Swarm, believing Kerrigan would lead them to new essence. Dehaka correctly predicted that the other pack leaders would refuse to similarly adapt; the other pack leaders were destroyed by Kerrigan, including Zurvan. Kerrigan confronted Dehaka afterwards, confirming that Dehaka had known that Zurvan would turn on her. He did not deny this—one zerg would grow strong, the other would fall. Dehaka remained with the Swarm.

Other than that, he has a solid offering of skills from StarCraft that could spill over quite easily.

We'll keep you posted when we know more.