Here are the full release notes:
https://connecteddrive.bmwusa.com/cm...es_1903_US.pdf
Some highlights:
BMW Intelligent Personal Assistant (new function)
The BMW Intelligent Personal Assistant is your on-board personal assistant. Start by activating the assistant with the command “Hey BMW.”
You can also name it yourself by simply saying “Hey BMW, change the activation word.”
Special information about this upgrade
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In some cases, you may need to re-activate Apple CarPlay. The checkbox can be found under “Mobile Devices” in the “Settings” submenu.
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Some settings may be reset to default after the upgrade (for example, interior lighting) and may need to be re-activated.
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Remote Engine Start could be deactivated after the update. Please activate Remote Engine Start after the installation. The function is located under "Climate Functions" in the "Settings" submenu.