As I noted on Kateja’s thread about her visit to Paris, up until now, masks have been required on public transport and when entering and exiting (or moving around within) restaurants; shop owners had the ability to require you to wear a mask to enter, but it wasn’t mandated by the government.
The government has now decided to go a bit further and require masks in all “enclosed public spaces.” So — shops, hotel lobbies, banks etc.
The decree detailing the measure will be published today or tomorrow, but the Prime Minister already tweeted that it will take effect tomorrow ! (How it can take effect before the rules are actually laid out is a very good question. . . )
As a practical matter, if you have been, like me, wearing a mask in all these places anyway, it won’t make much difference. But it will be nice to have all others doing it as well.