Yes...The Bongos already come with the compensated nut, but the fretless models do not and will not have the compensated nut. They don't work on fretlless basses.
We won't have the comensated nuts for models other than the Bongos until at least June, and we will let everybody know when we get them.
We will also retro fit instruments with the new nut, at the owners expense. I do not know what it will cost, but shipping both ways will be paid by the customer. I don't think it will be cheap. The compensated nut is much wider than the stock nut, so the slot that the nut is in will need to be widened, so tooling needs to be made etc. We will keep you guys posted.
Jon