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Welcome, could very well be. I guess we'll have to wait and see.
Now this is just the epic update I was expecting. The Misty Mountains are now a faction faithful to both book and movies, and looks really like a force to be rockoned with.
Every hero, every unit is well-designed and perfect to fill its role, though I'm kinda disappointed the Great Goblin has no 'Down to Goblintown' song ability to paralyze enemies and boost morale XD
As for Ringhero Smaug, I would suggest him to be enveloped in an aura that deals fire damage, since the book speaks about his 'Inner fire', and would also suggest him to be able to attack with Dragon Fire while flying, kind of like the Dragon Strike, as he did so in the movie. I would also say he steals resources when attacking enemy buildings, even if the Misty Mountains already have plenty resource-taking abilities.
I also kind of really like the 'I am King Under the Mountain' ability suggested by KingdomofErebor, as it does explain his extremely aggressive behavior towards those who touch his treasure. Also, as a visual effect, since he looks red and golden in the movies, once he obtains the ring he could become completely golden, and perhaps have a fiery glow about him.
Anyways, an epic work, as per usual.