There is no character reset. You keep your gil, items and levels. The only thing that may reset are any quests you are currently on, since many of them are being adjusted for 2.0.

The class and job system is remaining as is. There may be adjustments to jobs, but the actual system is not changing.

You have to keep in mind that 2.0 is NOT an actual, new game. It's a glorified patch that's acting as a cornerstone for XIV's re-release. Besides adjusted storylines, new graphics engines, new server structures, dungeon redesigns and a few other additions such as new races and a character redesign, there isn't anything changing as far as normal gameplay from what we have right now.