I'm indebted to comrade Bing Klazenby, who pointed me in the direction of this piece in the Guardian about the Moog Movie, particularly this quote: "Modern keyboards are like your wife," expands Rick Wakeman. "You only use 10% of what you need. With Moogs every knob has a use." Wakeman now has eight - Moogs, that is, not wives."
Watch the trailer here, learn more here, UK premier supposedly here at the Sheffield International Documentary Festival in November, but there's nothing about it on their site.
Judging from the trailer and the sites, the film looks great, with the slightly irritating presence of DJ Spooky more than redeemed by the terrifyingly skeletal presence of Bernie Worrell. (Jesus! I just looked at bernieworrell.com. I think there's could be a whole Bernie Day on the way...)