An eventual Kali Linux 2.1 would simply be a snapshot of the current software available, which 2.0 users would already have upgraded to.

Kali Linux's New Version 2018.3, Open-Source License War, Lenovo Announces Five New Android Tablets, Google Releases Open-Source Reinforcement Learning Framework and KD Chart Update ...

Kali Linux 2023.2, the second version of 2023, is now available with a pre-built Hyper-V image and thirteen new tools, including the Evilginx framework for stealing credentials and session cookies.