CMSIS Version 5 will focus on improvements and further industry adoption. The license will be changed to the permissive Apache 2.0 license, to enable contributions from interested third parties.
Support for the new ARMv8-M architecture will be added as well as improvements for ARM Cortex-A/Cortex-M based hybrid devices (with a clear focus on Cortex-M interaction).
The CMSIS-RTOS API and RTX reference implementation with get several enhancements:
CMSIS-Pack will get additions for generic example projects, project templates, and multiple download portals. It will also adopt the Flash loader technology from IAR Systems.
As announced on embedded world, the development repository of CMSIS Version 5 is now available on GitHub: https://github.com/ARM-software/CMSIS_5
ARM invites all interested parties to contribute and/or to provide feedback for the CMSIS project using GitHub.
Embedded
Just call the repo CMSIS (or better use the old one, or fork it).
Use branches to seperate different development efforts.
As Liviu stated. Splitting up each version does not help. You already see that there are issues "dangling" in the CMSIS git and may never migrate to the new CMSIS-5 git.
Please consider doing stuff the git/github way if you expect to get feedback.