First and foremost:  My apologies for sidetracking your thread, Malcolm!  
Gary--  I think mine is the K550.  Picked up another one using Keurig Club points and have it sitting in the closet.  These things are notoriously short-lived, so if either my home or work brewer bites the dust I have an instant replacement.  
Keurig has not been doing well on the stock market lately.  They recently announced they're letting 5% of their workforce go. Sodastream's cold beverage maker is not doing well either, so I'm afraid Keurig's Kold machine is doomed to fail.
I was startled to find Lipton Classic Unsweetened Iced Tea no longer listed at Keurig's website, but all is well; they moved it from the 'Tea' section to 'Iced Drinks.'  Whew!
Keurig just added McCafe, Gevalia, and Maxwell House brands to their website over the weekend. 
Back to Opal: I really do hope the Opal ice maker is a hit!  It's spendier than most other counter units, but it looks much sharper and produces nugget ice.  There's a large number of pre-orders; hopefully that's enough momentum to kick start a successful product.  If its performance matches the sleek styling, it could very well be a winner.  Word-of-mouth from enthusiastic early-adopters will be crucial.