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Seens that ArcheAge (AA) will be the first and only AAA sandbox mmo to be released in these last 10 years. Your producer, Jake Song, said that AA will be the "spiritual sucessor" of UO. So, we can wait to have back UO in a updated graphical version.
Jake Song classified the mmos in 2 generations: the first generation are mmos like UO, Lineage and similars. These were mmos with big freedom and poor graphics, producing true "societies" in-game . The second generation started with WoW, with mmos with good graphics, huge content, but very little or no freedom, with single-player like content. Song said that ArcheAge want start the third generation, retaking the freedom and recreating the "virtual worlds" of the first generation, but incorporating the graphical and some fun tools of the second generation (Ex: quests).
He said too that first mmos created societies while the modern mmos created a playerbase completely dependent in developers content, that consume all content of the mmo in little time and constantly asks for more, creating a vicious cicle.
However, i know only AA. Anyone knows any other big budget or AAA mmo to be released or produced that can be considered sandbox?