Depends on what you plan on doing. If you going to lvl new jobs and have a good active social ls with some endgame on the side you will have fun.
But if your the type to not enjoy lvling,make gil,crafting,camping nms,quests/missions.(Pretty much everything) And all you want to do is semi-afk in whitegate, I wouldn't.
Also, as a real answer the main thing that is new is Synergy/Evolith System and the Add-ons. Its alot to explain so I would just look it up but Synergy is a new craft skill, and Evoliths are items used in synergy to enhance certain gear, which you get from hunting nms. Theres alot of new nms, most are time spawned for the people who can't/don't want to do lottery spawns. The Add-ons are storylines, which an equipment reward at end, most people like them, some people can't stand them.