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I think its more of a case of KDE 4 being rather polished. A point release at this point brings more refinement, but its not a complete rebuild.
Found lots of KDE4 clips on youtube. Not sure what major UI changes the dude expects that he looks for 4.9 clips a day after release. Just have a watch at the KDE4 clips and be fine. They are not (so) different from 4.9 especially since its all customisable and most seem to tweak the default settings anyways before recording making it hard to guess what KDE 4.x they where actually using (bugfixes and performance-improvements are not direct visible in videos anyways if you not direct compare cases).