Tomorrow evening (Sunday 23rd) at 20:00 server time, Kalimar and I will be starting the work needed to make the new FFB client version live on the site.
As opposed to previous updates, we are going to attempt doing this update without any downtime, and without cutting people's games off.
Now, this will mean that old games will continue to run on the old server, while new games will be started on the new server. Reconnecting to a game will still get you to the appropriate server (meaning the server the game started on), and the old server will be running for at least a couple of days in order to have games finish properly.
Now, while we're hoping to be able to do this relatively seamlessly, there's always a possibility that it won't work as we expect and we may need to cut games off in order to do this migration. If you have some very important match, it might be advisable to not play it during tomorrow evening.