I think by "overhaul" I think they mean smoothing out the bumps. Some simple changes that wouldn't be harmful:

1. Significantly increased experience from 1-60
2. Class quests give a full set of end-game approximate gear at 50/60/70 like combat classes get (and can get via poetics)
3. Further cleaning up redundancies and cross-class abilities

I'd like to see them fundamentally change crafting so manual crafting is the only reliable way to HQ outside of significantly overgearing, but I know a lot of people don't like that idea. I also happen to think they're part of the problem -- having thousands of people mindlessly popping a macro and not having any real gating mechanism ruins the market and also the interesting challenge. It's more fun to try to optimize ARR leveling atm than it is crafting 2* recipes.