Aradoth has posted part two of their Horizons Herald. This Q&A goes into some hard details about the game mechanics. Here is a snip:
Q:What XML feeds will be available? Just stuff like the number of players currently connected, or even detailed information on guilds and players?
A:We are comprising a very detailed list of the XML feeds available however there are restrictions to these feeds in terms of who actually sees them, what information is displayed, etc.
Q:Can a guild organize its own events, quests? If yes, how far can one shape the world for own quests, and can these quests be available for everyone?
A:We are in the process of working on player created/guild created events and quests, however we do not foresee this feature being in the game prior to launch.