No, unfortunately the Four Seasons did not open a new restaurant where the Bristol Lounge used to be. This space is completely closed off and appears to no longer be part of the hotel. They do not have any plans to open a new restaurant or reopen that space in any form.
Aujourd'hui is their casual though upscale restaurant for breakfast and dinner. It has a bar and similar space to the Bristol but is often empty. They need a designer to refresh the space and a dedicated chef to shake things up.
This place can still make magic happen, but its apparent the owners are not putting the in the necessary investment to bring it back to the lively top of its game property it used to be.