So what are the new changes that will be after the Constantinople fork?
The new changes for the Constantinople fork can be found here for every main client https://github.com/ethereum/pm/wiki/Constantinople-Progress-Tracker
To summarize some of the main changes are:
- Reducing block rewards from 3 ETH to 2 ETH (Lowering inflation).
- Optimizing code (Refactoring code for the EVM), reducing storage costs for developers
- Delaying the difficulty bomb by approximately 12 months EIP-1234 https://eips.ethereum.org/EIPS/eip-1234 to give time for the implementation of proof-of-stake to be finalized.
EDIT: a great article detailing the changes can be found here. https://icodog.io/tech-analysis/ethereum-constantinople-fork-what-will-change/