Developer Dan Clark has shed some light on the newest WoW TCG expansion, Reign of Fire, recently, giving us the first real glimpse of its new cards, including 2 new Master Heros. This trading card expansion focuses heavily on the invasion of Demons, known as the Burning Legion, and includes a new mechanic: Portals. It was initially touched on in War of the Ancients, but due to the desire to focus on a few of the races, portals were put somewhat on the backburner. There was a glimpse of it in the Betrayal of the Guardian expansion, but now it's out in force.
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There will be sneak previews of the expansion in stores on the 20th and 21st of July, before its release on the 23rd.