I thought the original posting on DVDFile of the specs said end October.
Anyway R1 is the one to go for as in UK Paramount will use their rental only window so not out to buy until next summer. They also always seem to use identical extras worldwide.
I never had any doubt that R1 was the one to go for (if I was to wait for R2, it would probably be another 6months+), but Play and CDWow list the R1 release of this as different dates.