Players on the beta have noticed the levelling speed on the beta between the levels of 60 and 70 seems to have been increased. The total amount of XP needed per level is lower.
Tigole answered the queries about whether this will be permanent, on the official forums:
[blue=http://forums.worldofwarcraft.com/thread.html?topicId=8202385165&postId=82016278245&sid=2000#12]Yes, we’re planning on speeding up leveling in the 60-70 range. Keep the feedback coming. We are still adjusting it. Let us know what levels you are in what areas in this bracket. [/blue]







But Jamm here’s the deal - if you want to "fly" through Outland as most people will then this is good. If you want to take your time and do every quest as you are noting then go for it and when you get to 80 you may have 3-4 zones of quests to do (at coin/quest) so either way you win.
Hoji - I agree with you about the TBC instances - but the thing is people barely do them now. Most people barely do heroics as it stands, they go to KZ once a week and get 22 badges. People will have been running those instances for close to 2 years and unless they have an alt coming up are probably sick to death of them. So while it sucks to see the content "go to waste" as a lot of the pre-TBC endgame stuff did, it’s prbobably more the "nature of the beast".