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Spoilers: It's awesome.
You can find the full-resolution image here, and it's a beauty. Not only that; but this is original artwork of some sort of giant awesome monster attacking the city.
I won't be at the GP, of course, given I'm not lucky enough to be in Europe right now. But this playmat is sweet, and I'm jealous of those who do get it.
Eldrazi?
Looks like Pacific Rim to me.
Looks more like a Hellion to me:
http://gatherer.wizards.com/Pages/Card/Details.aspx?multiverseid=208256
That soldier is definetly Mardu…. do we see this as perhaps a dragon in Dragons of Tarkir?