As we all know, Nikon is very good at keeping secrets.
Given the release dates of the current, and past (SB800) units, it would seem they are overdue for something new.
From my perspective, a complete overhaul of the CLS/AWL system is unlikely, as they have so many current production units that are compatible with it (SB900/600/200), plus the SU800 and the discontinued, but venerable, SB800.
A Radio Frequency (RF) TTL system would be nice, but not likely for the same reason. Besides, two other vendors are already offering after market RF adapters for the Nikon speedlights: Radio Poppers and the yet-to-ship Pocket Wizard version.
Almost all of my work these days with my herd of SB800s is in manual mode with Pocket Wizards (Plus II and MultiMax), so an RF version would not have great appeal for me personally. While I have no data to confirm it, I suspect that the Nikon shooters market for the current CLS/AWL system is far from saturated. Perhaps somebody will conduct a survey and explore that question.
Thanks for the update on your travels. Let us know what you learn.
Hal HBB in Phoenix, Arizona Nikonian Team Member
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Photography is a journey with no conceivable destination.