Nostalrius Begins - Quality wow vanilla realm (1.12)

Hey guys so I watched the trailer again, and caught a glimpse of this!!!
For alliance members they'll be filled with joy.

https://www.youtube.com/watch?v=7LFUTCMUWgo

While it's been confirmed that dwarves do feature in the Warcraft movie and can indeed be glimpsed in the trailer I'm pretty confident that the frame you highlighted isn't a dwarf, but rather one of Durotan's Frostwolf clan members that accompanies him to the Searing Gorge to meet King Llane.

If it's anyone apart from just a random clan member it may be Drek'thar and likely the same Orc I've highlighted in the top image here:

http://imgur.com/a/D9cso

I've highlighted frames where dwarves are seen briefly in the trailer in the bottom two images.