I'm new in Lightroom, currently testing the LR 6/CC. The import dialogue had changed since version 6.2, generally no problem with that, but I miss the possibility of accepting the import of duplicates to the LR-database. I read of this option in the German book "Fotoforum Crashkurs". I also saw a video on YouTube explaining the new import dialogue to me, but this option was not mentioned there.
Thanks for answering.
Generally, Adobe does not announce in advance when changes to software or documentation will happen.
If you need your images more than once in Lightroom, you can make virtual copies in Lightroom to handle this situation.