Let's say I have a character logged out in The Barrens at the location where this "lava chasm" division is going to be made. Does this character fall to it's death (assuming it's high enough) when Cataclysm hits?
Now I'm sure Blizzard already realizes this and will probably just reset every character's position to their hearth or the nearest inn. However, it would be funny if they didn't address this issue though. You'd have people logging in under new mountains too. :-X