According to an invite posted to colette.fr, the store on rue Saint-Honoré in Paris will open for the event from 11.00-19.00. The pattern of dots featured on the invite looks similar to the app icon layout of the Apple Watch, with each dot representing an icon.
It appears that Apple's design team may be part of the event. Industrial design team member Mikael Silvanto posted photos to Instagram documenting his trip to Paris for Paris Fashion Week. In one photo we can see a member of the team wearing an Apple Watch. Another photo appears to show Jony Ive and Marc Newson in the background on a plane.
Take a look at the invite and the photos below. You can learn more about the Apple Watch here.