My understanding is that patch 3.0 reduces the XP requirement, per level, from 60-70 by around 30% (slightly less I think). You can log in to the PTR and see how much the XP needed moved down, someone did that recently and I saw it was around 30% per level.

You can already do 60-70 via quests and skip all the collection quests, although you will only have around 1.5k or so gold at the end (if you save all 65+ quests till 70 you can knock them out and end up with almost 5k). So hopefully it'll allow more gold questing at 70 with the XP curve changes.