There was a recent discussion (11/10/16) on the kde-devel mailing list that centered on this issue. It was/is titled "Dropping kdelibs4-based applications in KDE Applications 17.12" for those that would like to take a look.
As for kdialog, my understanding, some functionality continues to (thankfully) invoke the kde4 backend (e.g. 'kdialog --getcolor') (which thankfully still works as it did in kde3, because the plasma colorchooser is all screwed up with the color pallet backwards, broken focus capture for middle-mouse control or the brightness rule, and no ability to remember a custom color from one launching to the next.... not very useful... Shudder, brings back memories of the "Release" of KDE 4.0.4 in May 2008)
As for kdialog, my understanding, some functionality continues to (thankfully) invoke the kde4 backend (e.g. 'kdialog --getcolor') (which thankfully still works as it did in kde3, because the plasma colorchooser is all screwed up with the color pallet backwards, broken focus capture for middle-mouse control or the brightness rule, and no ability to remember a custom color from one launching to the next.... not very useful... Shudder, brings back memories of the "Release" of KDE 4.0.4 in May 2008)
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