Seems like early Nov. is unlikely. Wiki for OSX releases (i.e 10.0 10.1 10.2, etc), all of them were released at the end (24th-26th) of their respective months.
I also have a question: I'm new to Macs and have two Macs at home now. Can I just buy one SL CD and use it to install on both machines?
Technically, you can do that - but legally, no. Just buy the family version ($50) if you want to upgrade two or more Macs (up to 5).
And I'm hoping it comes out mid-Sept. Even though it's not typical, neither is the OS (a OS with little/no end-user features). Let's hope.