Didn't realize it was scheduled for September. I just got the update yesterday, and then I heard Luke from Cord cutter's news mention it at the beginning of the week / end of last. So thought by that, it was scheduled for October. Anyway, overall, my Roku Ultra 4802 feels snappier after the update was installed and it sat overnight. I tried some content this morning, and it was a really good experience.
For the past month or two, I have been using my Chromecast with Google TV more than the Roku though, mainly waiting on some issues with Roku to be resolved, and I like the Google TV interface better in some ways over the Roku. However, with that said, all the issues I was having with my Roku (except 1) have been resolved, so it seems to be stable again, and the one remaining, is channel related, and not Roku at this point. So, it's pretty usable again.