Expect a little downtime on Saturday morning. I have a small forum software update to install, and want to reboot the server which has been up 24/7 for about 5 months.
If everything goes as planned, it should take less than an hour. If it does not go as planned, it will probably take exactly more than an hour
Visually you should not see any changes, so nothing shocking.
No planned start time, just sometime in the AM, CST.