Here it is late August, and still no vendor to be found that makes a thunderbolt CF reader. 
I just bought the latest and greatest 13" Mac Book Air -- I have to go back to using CF USB readers.   I miss the firewire. 
The only other problem I've run into is that my iOne colorimeter has no driver for the new OS release, and the manufacturer has discontinued the product- so I'm forced to buying a new colorimeter to calibrate.   Having said that, I don't intend to use the MBA for any serious color work.  it's a travel computer -- to compliment rather than replace my desktop system. 
Ron