So, you just downloaded the latest update and you want to know if anything has changed.
Here's the scoop!
OTA updates take about 2 weeks to reach the entire fleet. We don't know how it's done.
Every new version is closely followed by sub-versions. which tweak the update. These are bug fixes. They don't come with updated release notes. Press the "T" on the 17" screen for your version number.
A download notification will appear on your screen, and perhaps on your mobile device, when an update is available. You can initiate installation immediately or program the install to start at a later time. If you close the screen and did not set a time for install you can always touch the alarm clock icon at the top of the MCU to access the options.
An install can take from 45 minutes to as long as 2.5 hours depending on the scope of the update. While the car is installing the update it will appear dead at times, sometimes it will appear possessed. Regardless, you won't be able to operate anything in the car until the install is finished. So, plan accordingly.
To see all of the minor change versions and their effect go here: https://teslamotorsclub.com/tmc/threads/model-s-software-firmware-change...