Naim have just a few weeks ago issued new firmware for the NDS and other green screen streamers and Unitis. This was a major undertaking as Steve explained in detail in an earlier post. I would be very surprised if that was the last firmware update Naim issue for the NDS.
But as ChrisSU said, all Naim can do is support what the NDS etc can currently do. There isn’t spare memory or processing power in the old platform to add new services.