*looks at story arcs* Hmm, hmm, yepp, that's NTR right there. *nods*
Now, serious mode:
We keep the content that was in Runaway Princess. We are not rewriting it as in "take the idea but make a new story out of it". The rewrite is changing the dialogue, true, but we do it to make it better, more fluent and fit better to the characters the stories are told about. The betterment is obviously subjective, so we will see how that goes.
For Willowdale, as an example, we will still have J doing his stuff and Randy is going to be Randy.
We will give it our own spin with some new content even for Willowdale and especially later on in the Brexton arc and after, obviously. The new spin we give it, will be seen as soon as you start the game, but you will feel as if you were back in Runaway Princess shortly after. That's what we hope, that's what we aim for.
TL;DR: Yes, NTR and all the other "fun" stuff confirmed.
P.S.: But we will also have a setting to block it or skip over scenes.