The 2.0 Kettle has completely different electronics and is a different platform to the previous generation - a lot more different than, say, the difference between two generations of iPhones.
The first and second gen kettles were designed to be accessed via WiFi on a local network only. They cannot access the internet. The 3rd gen kettle and 2nd gen coffee machine can directly communicate over the internet, and allow other devices to securely communicate with them via the cloud. The previous gen products cannot get a software upgrade to give them similar functionality, it is beyond their scope and their platform doesn’t support the security required.