Your existing phone isn't partitioned correctly and won't be able to perform seamless updates. Seamless updates aren't a requirement for manufacturers.And it is better for security because it can happen automatically when you reboot your phone. It keeps you from having too much downtime (and there are plenty of folks who will dismiss an upgrade notification because they don't want to fool with the current process).
But it's new for Android and does two things. If you have the Chrome browser on your computer or have a Chromebook, this is exactly how those systems or apps update. The next time you update, the other system partition will be wiped and used. This file is changed to point to the new system partition instead of the current one. A configuration file used during the boot process (equivalent to /etc/fstab for the Linux nerds in the house) is read that tells the kernel and boot process where each partition starts and stops. This is done without moving the partitions or renaming them because they are numbered. Once all this is done, you can reboot and use the new system partition. Two system partitions means more space will be used. This is good for system security (the data partition can have its own set of file and folder permissions) and it makes things pretty convenient for seamless updates. The way Android is divided into individual partitions means the data portion - where all the information you've entered about an app, things like address books or settings or game save progress - are stored in a separate spot outside of the place where the actual system files live. When using a phone that can perform seamless updates, all the unpacking and transferring is done while one system partition is running, and things are copied and moved into the second partition. Seamless updates work by having two different system partitions on your phone.
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