The last studio album was released Sept 30, 1997, one week after tour start. Back then the schedule was like this:
Aug. 18: Press Conference
Sep. 23: Tour start Chicago
Sep. 30: New album release
See press conference report: [
iorr.org]
No need to release the album before the tour has started. Actually they want the tour opening press coverage to boost the start of album sales.
Bjornulf