ok well this is some info I got from a guy on a guild site and he is pretty smart and generally correct about things.

"During the Alpha, leveling was pretty quick, faster than it currently is in the Beta. They changed that for the Closed Beta, slowed it down a lot and moved the focus in experienced from grinding mobs to quests and instance runs.

Blue also said that they regard the current situation as a sort of "opposite extreme", where it is much slower to level, and that the final curve will be somewhere in the middle.

I figure the 60-70 is going to take a person about as much work as 40-60, maybe less, and not the outrageous 1-60 figures that have been bandied around."