From reading through this thread it seems like the size of the update is larger than what would be needed for the frunk/trunk opening feature. So hopefully there are some bug fixes and/or laying the groundwork for future upgrades.
I haven't owned our MS long enough to be jaded regarding updates. To me updates/bug fixes are still a "bonus" after years of owning ICE where what you purchased is what you had and the only upgrades were from the aftermarket or tuners.
I had a similar surprise on my way home from work Friday. Opened the trunk and placed my briefcase etc inside, closed the trunk, got into the drivers seat, the main display was black and the dash was lit but blank. From habit I pressed on the brake, the headlights came on and a message popped up on the dash "system is powering up, press the brake when this message disappears". I messed around on my phone for awhile (emails/texts) and nothing happened so I pressed the brake and the message went away. However, both screens were still blank. I rebooted and everything started functioning normally.