I got an email from the exchange I use stating the Istanbul hard fork is to occur at block 9069000 at approximately 15:44:36 PST on December 7. It happened already but they have suspended all deposits and withdrawals from happening until further notice.
It is not a contentious fork and so does not result in any new coins from it happening.
So why would they decide to suspend all transactions of ethereum?
Yes, almost all exchanges warned about update. I cannot explain since I am not aware of technical issues, but essentially the deposit/withdrawal is frozen during this time period.
The fork took place with success. The year 2020 will be the year of ethereum.
I did not find any information about the outcome, if you know something about it, you can share it with us.