It hasn't actually moved. If you apply a monochrome treatment (by profile, by pressing the "V" key, or by clicking on "Black & White" in the Treatment line) you'll see that the "HSL/Color" panel changes to "B & W", where the Black & White Mix sliders will be found.
It just seems like it has moved for all those folks who used to click on the "B&W" in the panel header "HSL/Color/B&W" which is now just "HSL/Color". Why remove it from the header? who knows... it was intuitive, I've never had to look up how to make an image B&W in Lightroom until now (and I explored LR before turning to the web). When a user has to lookup on the web how to do something simple it is an interface fail IMO. B&W adjustments deserves a panel all of its own instead of being hidden under the basic panel..
That's my constructive 2 cents..
well when I click the Black and White option or Monocrome the HSL Panel completley dissapears... why mess with something that was logical they need to get it back where it was. This has now become very frustrating and I will have to look elsewhere for my B&W conversions when it was a very simple task previously!
ADOBE FAILED on this one!
when I click the Black and White option or Monocrome the HSL Panel completley dissapears...
It does not disappear for me, but the HSL panel does change to B&W with [Black & White Mix] showing the color channel sliders.
"B&W Mix" (as I understand it) is another name for 'Luminance'.
And why would you need Hue and Saturation for a monochrome image?
I do not see where "ADOBE FAILED" although perhaps a 'less intuitive' UI.