Just got back from Paris and I had the chance to drop into the little temporary Left Bank store. They may be "growing" new staff--the young woman I spoke with was full of energy and thrilled to have begun working for H. Smaller space, and the design was a little fresher and younger--rustic, cute, somewhat whimsical displays.
Nowhere near the selection of the FSH store, of course, but a pleasant trip. According to one person, they will not be selling birkins at this location (probably not kellys either) so if your strategy is to score one of those bags, stick to FSH and George V. If on the other hand you are happy poking through a more limited (but still lovely) stock in a fresh new place with charming designs, it makes for a pleasant and easy detour when you are in the 6th. And you can make friends with some of the newer faces working for H.
The staff is thrilled about the eventual new store--sounds wonderful.