Sorry for being stupid. What is NG+?
New Game Plus. It can vary from title to title but generally you're able to start a new game and import the state of your player character from the end of your previous playthrough so they would retain their character level, skills, inventory, money - things like that. Sometimes all, sometimes only one of those features is used, it varies from game to game.
For example, in Deus Ex Human Revolution with the Director's Cut they included a NG+ mode which had you keep your skills/augmentations when you started NG+.
With Witcher 3 I'm hoping that it'll carry over:
Player level (as I hate the level requirements for equipment)
Player skills (no desire to have to play with a reduced skillset and less enjoyment)
Player inventory (or at least Mastercrafted Gear)