The Demo should launch very soon. Said Demo will ony contain the world of Ravnica, so here is some basic information on the plane:
Ravnica is a worldwide cityscape; an ecumenopolis consisting of a patchwork of grand halls, decrepit slums, and ancient ruins, with layer upon layer of stonework.
Of the world's countless civic centers, one looms large above all others: the City of Ravnica, a metropolis so vast that its name has long since become synonymous with the entire plane. Centuries of Ravnican business — powered in many cases by Izzetboilerworks and other guilds’ foundries — have saturated Ravnica’s atmosphere with all manner of industrial pollution. Prior to the events of Dissension, the city and plane of Ravnica had been ruled by guilds of Ravnica and governed by the Guildpact for more than ten millennia.
As a plane, Ravnica seems to be isolated from the rest of the Multiverse, in a seal similar to the Shard of the Twelve Worlds, but with Ravnica as the only plane. On the surface of this 'micro-shard' is a blister, a piece of folded aether that traps all Ravnican souls upon death, forcing them to become spirits and ghosts that manifest themselves on Ravnica's physical plane. This phenomenon might also improve the lifespan of its inhabitants; for example, Agrus Kos is a normal human, who is over 120 years old, an age likely roughly equivalent to 65-70 years on Earth.
