The larger point to be made vis a vis the dichotomy between CC and Perpetual license Lr is that it probably costs more and has more logistical issues to maintain Lr updates without the features of CC. That is to say, they are either keeping two different code bases which they are updating or the functionality updates (Dehaze, Guided Upright, etc) are locked/unlocked via the validation mechanism. In the first case, there are real costs involved and in the second case, they are just being pricks. In both cases, the point is to drive people to the subscription model.
Full Disclosure...I have the CC Photography Plan at a current rate of $7.99/month.
I don't think they have two different codes, only two different UI's. That explains why perpetual license users can still download and use dehaze presets. The only thing they don't have is the slider.
Btw, next to an update there is also a small upgrade for perpetual license users in this release. You now have X-axis and Y-axis offset available, which is new functionality vs. 6.5
That can come in handy when using perspective or other corrections to access pixels that are falling outside the original frame, In the past you could only recover those by reducing the scale, but this is much better.
Thanks Adobe