We dont know requirements, but we have been assured the goal is to optimize it for older comps as well. So its not going to be anywhere near Skyrim and tho the game scenery is gorgeous for mmo, you can see it wont be that demanding
If you really think a full blown MMO wont be as demanding as a single player game like Skyrim you are kidding yourself. Wait till you get into Cyrodiil with hundreds of other players let alone normal grouping.
And as much as i like Skyrim i think the graphics were not really all that especially when you compare it to games like The Witcher 2. Yes Skyrim is more open than TW2 but even so the graphics were not that good IMO.