Update:

CD Projekt Red community lead Marcin Momot has revealed the details about New Game Plus mode being added to The Witcher 3: Wild Hunt. Momot explained that your level, gold and gear carry over to a New Game Plus, but certain things will be removed for the sake of normal progression through the game's story and quests.

Here's what Momot said about veteran Witchers who go to a New Game Plus:

Enemies will be stronger, obviously.

What carries over? 
Player experience (if you're below level 30 when finishing the vanilla game, you will be bumped to level 30 for the start of NG+), items (excluding: quest items, books & letters, Gwent cards, usable items, trophies), money and alchemy recipes.

When starting New Game Plus you can select any difficulty level.

You can obtain the Death Match achievement when playing the NG+ mode.

What's the starting level of the character when beginning NG+?
The same that you had when finishing the game, if above 30, otherwise you start at level 30. You also get a free Clearing Potion at the start so you can reset your skills and try a different build.

Original Story:

CD Projekt Red has confirmed that its 16th and final piece of free DLC for The Witcher 3: Wild Hunt will be the addition of a New Game+ mode.

For all you completionists out there, it's quite easy to dump dozens upon dozens of hours into The Witcher 3 for the sake of clearing every little side mission and exploring every area of the Northern Realms. Now just imagine doing all of that again. That's right — CD Projekt Red has confirmed on its Facebook that their last piece of free downloadable content for The Witcher 3: Wild Hunt will most likely allow you to restart the entire game but at a higher difficulty while retaining your hard-earned gear and skills. CD Projekt Red representatives claim the New Game+ mode isn't launching this week as they're trying to iron out all the kinks of introducing your uber-Geralt into the steroidal version of the Northern Realms.

The Witcher 3: Wild Hunt's first DLC expansion, Hearts of Stone, will launch this fall. The Blood and Wine expansion will launch sometime in early 2016. Hearts of Stone will have Geralt travelling to No Man's Land and Oxenfurt to work for the Man of Glass. The Blood and Wine expansion will add the new zone of Toussaint, where the war isn't as big an issue, but bloodshed regularly happens in a different way. These expansions will be available as a part of The Witcher 3's Expansion Pass, which costs $24.99. Considering the amount of content given for free, I personally can't wait to see what CD Projekt Red has planned for its premium DLC. I'm guessing each of these expansions will be about the size of an entire world zone, which offer countless hours of content, especially if you're like me and try to explore every noteworthy place on the map and solve every quest you come across. Now just imagine going back for all that with a New Game+.

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