File:Hearthsteed with dwarf rider from Hearthstone promo blog.jpg

Summary
From: https://bnetcmsus-a.akamaihd.net/cms/gallery/HCO2AY801Q5U1394473364583.jpg

From article: http://us.battle.net/hearthstone/en/blog/20056282/a-new-hearthstone-hero-has-come-to-light-3-14-2016