Hi Arthur,
Nice to hear your interest in using ATIK on OSX!
All capture applications need to be developed to use drivers - either directly or using a layer such as ASCOM that allows ASCOM drivers to simply "work" with any ASCOM capture application. Unfortunately the Mac does not have an ASCOM layer - I have been working with other mac developers (such as David Hulse , author of EQMac) to create AOSX however this work and personal things (getting married etc) have all slowed the progress.
Although I don't work for ATIK, I have worked in my own time, to make an OSX driver for capture applications on OSX to use. I have also been talking with capture application developers about adding the support to their capture application - progress on this is good with the likes of Craig Stark (Nebulosity and PHD) ready and working with me.
Obviously I can't comment on ATIK in this area; but I have a large scale testing for the B3 release planned shortly (testing Titan, 383L, 4000, 11000 etc all on the back of my Pentax!) - this will then be released to Craig and the capture application developers to freely use.
As an astronomer too - I also want to be able to use my ATIK hardware on a Mac!