NVidia now support for long term (they actually called it long-lived) drivers for Linux platform. The purpose of having this branch is because not everyone has a chance to buy new hardware or some prefer to have a more stable system without any need about new features from their vendor (Ubuntu LTS users for example).
The new branch will only have bug fixes and small maintenance efforts compared to normal drivers which are released periodically. I'm not sure how will NVidia handle their release process, but i thing it will not be as often as regular drivers, since they only provides bug fixes and most of the bugs exists because the introduction of a new features.
They have started to release their first long-lived driver and it came from 275.xx series.