I have just spoken with two different people in the Paris store. Both say that the date of the sales will not be released firmly until early next month--May.
Here are my thoughts. Given the fact that the formal sale period will begin June 30, if I had to make my best guess it would be that the Hermes sales will start on that same date--Wednesday, June 30. I cannot remember the sales ever beginning in July.
There are years when the Hermes sale begins on the same day as the citywide sales. Other years, the Hermes sales begin later during the formal sale period.
Given the information from various sources here so far, I would guess that June 30 would be the most likely date. But would I buy an airplane ticket based on that guess? Personally, not yet. I would prefer to have firm confirmation from Hermes directly. Please note that the "article" giving the dates is actually someone's blog site. I am not saying they are wrong...just that I would still be a little cautious.
I promise to continue to call FSH. I will report here right away as soon as someone from the store tells me directly that the date is confirmed.
ITA. I'm waiting on official confirmation from H before I book anything.