I would say time, from what I have read VA are keen to press them into service ASAP.

A very reasonable point.

What is the seating config for these 'new' frames? Do they have VA or KLM interiors?

138 economy seats.

As opposed to VBY and VBZ that have 8 J and 120 Y.

First 4 rows economy x

I read the aircraft above is being planned for a delivery flight as 2-HBGT on December 8th.

That would make sense as VH-NHW must be just about ready to leave XSP and 2-HBGT will replace her in maintenance. NHW also did a blip on FlightAware yesterday as well.

For the ones in Europe:

PH-BGX is currently in Norwich (for paint ?)
PH-BGK was withdrawn on 25/11

NBP looks or will be making it's first visit to Perth on the 11th as VA687

New expected delivery date: December 13th.