Stephen,
In the interview, he simply mentioned Chronometre Optimum as one of the upcoming projects in the future. Nothing more I'm afraid.
I have came across 'Chronometre Optimum' in a previous interview. I am in the midst of browsing through my stack of magazines and so far, I am unsuccessful. If I recall correctly, he mentioned that the watch is of such accuracy that he decided to name it the Chronometre Optimum... somewhere in the lines of this but do not quote me on that. He also mentioned that the plans has been laid out but he simply do not have time to execute the task at the present moment. (And yes, it sure does sound like Optimus Prime! lol.)
Perhaps, a PuristS interview could further clarify this?? 