v1.4.x is a new major breaking version, the main updates:
- Implement block-stm parallel transaction execution.
- Upgrade to cosmos-sdk 0.50.x and enable optimistic execution.
- Upgrade to ibc-go 8.5.x and support unordered ica channel.
- Implemented cluster benchmarking infrastructure.
Upgrade Plan
It takes a coordinated upgrade from 1.3 to 1.4, the upgrade plan name should be v1.4.