Constantinople is the most recent framework wide update for the Ethereum stage and the following stage on the guide towards Ethereum 2.0, when the accord convention will move from confirmation of-work to evidence of-stake. These substantial scale code redesigns are regularly alluded to as "hard forks" since they make a changeless break from the current Ethereum code.
Where is the "introduce" part really?
Whatever, Ethereum community has published a blog post at 22nd Feb. The post telling us what they will do their network.
You can read it here:
https://blog.ethereum.org/2019/02/22/ethereum-constantinople-st-petersburg-upgrade-announcement/Summary: They are preparing POS integration. And they are using double names for their upgrade due to delays.