I just got an update on LibreOffice, and it seems that the style has changed for the UI. I believe that they changed from GKT2 to GTK3, I'm a wrong if the assumption? If I check my config, I have qtcurve for GTK2 and Breeze for GTK3 (unfortunate there's no qtcurve for GTK3). So I believe that's why it has changed slightly.
I just read that upcoming release of LibreOffice will get KDE5 integration? Any clue what kind of integration this will be?