Book 2 NG+ mostly works even if none of the extra story content is in...it's fine-ish. Main thing I wanted was all my gems to carry through from Book 1 NG+ and they did. Will have to finish Book 2 and then into experimental Book 3 to fully assess the damage and whether it's worth staying on these beta branches for now. The full Book 2 NG+ will be a lot of fun for sure when it arrives but Book 3 NG+ could be really far away as I think Droid will work on a new game after Book 2 NG+ if I understood correctly.Book 2 and 3 NG+ is not done yet and a lot of things are not set.
You will need to wait till book 2 NG+ is done to be able to play as it should be played.
That is what I am waiting on to play this great game again racking up another 20-30 playthroughs.