If the RO world was recreated with graphics from the year 2013 and it was fully 3D, with action-based-directional combat instead of tab-targeting(or just birds-eye overview aka diablo mode), with the option to teleport across great plains of land, with things like random monster spawns everywhere, freedom to go where you want as long as you're powerful enough making it more gear and skill-based, instead of level-based(such as RO) with gear that can be used by more classes and level ranges, with unique skills and traits that are from all over the game-universe, with full-stat allocation where you start with +1 of every stat(like RO) so you can really create the unique class and build you want...
It would be the rebirth of the MMO genre.
Seriously, no other MMO that I've seen today has allowed for the freedom in RO. I really hope this one allows for freedom of stats and gear.
The locked-down "follow our path" MMO's today(RO2 I'm looking at you) with static-spawns for monsters that are in small areas and where you can barely customize your own character.. it's not fun.
Man I hope Tree of Savior pulls through. It could be great.