Adobe has said that camera raw updates and bug fixes will be available for LR6, but only CC subscribers will get new features. Presumably until they all get incorporated into LR7.
Adobe has supported CS6 for much longer than many originally thought. The Free DNG converter is still available.
Here are a couple of blog posts:
Lightroom 6.1.1 is now available, with bug fixes and new camera/lens support — the announcement is right there on the front page of the Lightroom forum.
There's no reason to think that this will be (or something else was) the last update for Lightroom 6.