In addition, this can also be confirmed on Disneyland.com by looking at dates on the calendar beyond today. It was listed through the end of September, but now appears to stop after Labor Day, I am wondering if they have changed their minds yet again and are going to stop after Labor Day.
This would make some sense, every show that they have put in there has ended on Labor Day and aside from Steps int Time, which opened with the park they all have started (unofficially) the weekend of Thanksgiving. I am going to have to look into this now, I will let you know what I find out.
After looking at the OFFICIAL park blog, it appears those dates may just be missing performances due to construction, see the article at:
http://disneyparks.disney.go.com/bl...nted-genies-run-extended-at-hyperion-theater/
I would still try to recommend seeing it before Labor Day, because Disney is notorious for changing their mind, if you want to see the final performance, I might even recommend seeing the last performance on Labor Day, as they might just decide to not bring it back (thus avoiding huge crowd issues for the final performance), they have done stuff like that before too.