I've been there two of the last three Octobers, but not the most recent. Park Hours from what I can remember.
MK -- was 9-9 on nights there weren't MNSSHP. Maybe 9-10 on the weekend non MNSSHP, but closed at 6 the nights of the MNSSHP.
AK - was 9-5 daily.
EPCOT -- 9-7 FW, 11-9 WS.
Studios - 9-7:30 during week, 9-9? on the weekends.
That is the best recollection I can give you. We were mid-October three years ago like the 11-19th, and late October into November two years ago.
Weather - Mid-October was hot, hot, hot. Record heat. 100 degrees, 100% humidity. Much like our trip in early June 0f 05. Except not as much rain in October. It was cooler the end of October but still warm. High 70's and 80's if I recall. More pleasant.
Rehabs - The first year there seemed to be more stuff that was under rehab. Big Thunder Mtn, Tower of Terror, Swiss Family Treehouse. The second year the only thing I recall was Small World on rehab.
There were crowds on both trips. More so the earlier time frame as it was over the holiday (Columbus Day - I think) weekend. And with the park hours not being as long it seemed to make a difference.
I liked October, but I still think that early June is better. But I wouldn't hesitate to go back in October.