
Basically what the update does is turn off the current to the charging pins when the device is not being charged. This way when it encounters body sweat that doesn't cause a chemical reaction which results in corrosion of the charging pins. If there's no corrosion users are likely not going to complain about skin irritation.
The update has already been released even though a detailed changelog was not provided previously. It is possible that this may just be a pre-emptive measure, better to be safe now than sorry later.