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There have already been a few interivews that have told us that the game is going to be very linear and somewhat "on rails" aka WoW like in it's questing. Although while doing the "on rails" portion, they have said that you will find additional dungeons and events to jump in on via your minimap. (think Skyrim)
But one thing I would like to see answered, is "how big is the game world?" Just how much exploration will we find? Over the last 10 years we have seen MMO"S continually shrink in game world size with each release. EQ took 10-15 min. to cross some of the zones. Now we have games like TSW, eq2, wow, guild wars etc where you can not only cross the entire zone in 3-5 min.
Instead of huge immense wildreness areas with mobs spread out and just big empty spaces, we see much smaller areas filled to the brim with mobs. So much so that you can't walk 10 feet without some baddie to kill. So i personally would love to know, just how big the game world will really be?