Looks nice, but... how about Ctrl+D instead?
Honestly, I don't see myself using this functionality in the next million years. Note to self, don't accidentally invoke the pattern tool. The video presentation is way too much data dump and not enough "what does it sound like?".
Say I've got a killer drum pattern that I want to copy, I can already groove clip it or copy and paste it. I suppose I could use the pattern tool but what if I miss the snap? Everything is going to be off.
Meh! Ctrl+D would have been a lot more useful.