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Just heard about another sandbox game in what appears to be early stages of development. It appears they intend to focus on a dynamic world, with complex guild, social, and economic systems.
The website is here: https://portal.annorath-game.com/#
A tech demo can be found here: http://www.youtube.com/watch?v=JVainTIs_08
Hell hath no fury like an MMORPG player scorned.