"Please note that the following class tuning changes are still in-testing."

[Skylarking]

Does this mean that the hotfixes are live, but they aren't sure if they want to keep or not?

[Foj]

In general that means there may be a brief delay before those hotfixes go live.

In theory they could be rejected and not deployed for some reason, but if that happens it's extremely rare.

The time frame for these things going live is generally something between "already live" and one day, usually a few hours.