Not yet. They are working on it right now, even at 1:35am their time. I know they want to get it back up for all of us.
Without any sarcasm, I appreciate they are so enthusiastic at their job that they try to fix the problem during nighttime.
But a downtime during the fusion event is really bad. I have a job, I can't play 24h a day and right now, when I could play the game, it's not possible. They should really enhance the time of all actual running events or give the fusion shards as compensation. Energy and gems as compensation don't give me the tournament points I'm missing right now, that will end in missing the fusion champs.