Hearthpwn

Apparently it looks like this is his card art:

All villains are doing cool stuff.

My guess is 7 mana 7/7: "Shuffle 7 Boombots in your opponent's deck. WARNING: bots may explode"

Because of the legions of Boombots behind him, I'm thinking something more like 10 mana 5/5: "Summon a Boombot for every friendly Mech that died this game" 

Then the Boombots would work the same as they did with the original Dr. Boom. Maybe this might be too powerful, but it would be cool to have more build around cards like this.

I doubt it will have anything to do with boom bots lol.

7 mana 7/7 craft a costume zommech ? 

iron Boom maybe. Art look amazing maybe  craft in gold .

I'm predicting this card will have something to do with Boombots, and spare parts!

Quote from NayrSlayer >>

Because of the legions of Boombots behind him, I'm thinking something more like 10 mana 5/5: "Summon a Boombot for every friendly Mech that died this game" 

Then the Boombots would work the same as they did with the original Dr. Boom. Maybe this might be too powerful, but it would be cool to have more build around cards like this.

 That would be cool as lockdown tool for a warior. Imagine 10 5/8 with that battle cry summon 13 0/1 bombs with taunt on field.

He will probably have some recruit effect, or that would be my guess.. 
Maybe something like "Whenever a friendly Mech dies, recruit a Mech." - or maybe a similar effect but instead of recruit, it would be "...summon a Mech from your hand."

But tbh, I hope I am wrong as I'd rather see a new and interesting effect like the new shaman legendary.

He is fully armored, so maybe it's armor related.

I guess 7 Mana 5/5.

Battlecry : Fill your side of the board with 1/1 Boom Bots. 

He will be 7 mana 7/7 for sure... Because flavor... Ability will be mech related probably...