AK got updates today - EMH every night through Aug 19th? Reg hours extended until 10 as well... so AK is 8/9 to 12 with EMH at least until the 20th...
I guess the good news is, the releases seem to come in batches. It's not a definite no for my time-frame (Aug 26 - Sept 9) yet, but mostly likely if new hours get released it will be AFTER I book fast passes. I know I can't book FP+ during extra magic hours, but in general, I'll be less likely to want to switch my days around after I've made FP. The hours have not been increased for Labor Day weekend, and at least for the past 4 years, Disney has increased hours at MK on this weekend. I think there is likely another update coming.
I've noticed that Disney tends to treat the last week of August as part of Fall, instead of summer. Hours are usually different starting this week. Water parks close earlier, Fantasmic & Star Wars shows start earlier, MK closes earlier. It will not surprise me if extra magic hours at AK are offered on some nights, as opposed to all nights. I just can't guess which nights it will be.
From Aug 27 - Sept 2nd AK hours at 9 - 930pm, Sept 2 - Sept 9 AK hours 9am - 9pm
AK has early magic hours on Monday & Saturday only
Sunday is evening EMH at DHS
Tuesday is evening EMH at Epcot
Wednesday is evening EMH at MK
Tues & Fri are often
MNSSHP at MK
Epcot open later on Friday & Sat once F&W starts
So, maybe Thursday? Hopefully, Thursday. I have two Thursdays planned, so that would work out really well for me.