New Nighthawk-pattern Storm Eagle?

This could be just nothing, or maybe there is more to it that just creative freedom on the writer's end. On the latest Horus Heresy book, Angel Exterminatus, we get a glimpse of 2 loyalist Space Marines using a variation of a Storm Eagle that one of them calls a "Nighthawk-pattern", and that is described to have "stealth capabilities" and to be "multi-spectrally camouflaged". The weapons descriptions seem to be the same as the current model though. I don't want to spoil you the (good) read that Angel Exterminatus is, so get yourself a copy if you want the full details.

"Coloured a dull midnight grey, its swept-back wings bristled with cannons, and its strubby prow with linked banks of heavy bolters. Missile racks on his upper fuselage locked into place with a clatter of loading mechanisms"

"'I designed the Nighthawk-pattern, remember?'
(...) 'You know, Sabik, I think the Mechanicum might give this variant their seal of approval after all', he said.
'Yes'?
'Yes', said Sharrowkyn. 'Eventually'"

It is interesting to mention that this is a conversation between an Iron Hand and a Raven Guard. Will we see something in the 6th ed Space Marines codex?

What makes me think there could be something behind it is that we have recently had the Ravenwing novel anticipating the new Dark Angels models, in this case the "shrouded land speeded" and the flyer. As Games Workshop continues to improve the synergies between their different business branches (40K, Black Library, Forge World) we might see this happening again in the future. For now take it with some salt.