I just checked out comiclist.com, and they had the latest shipping dates for Section Zero. Right now, Section Zero #6 is scheduled to come out on March 30 (which is a Friday, so most areas will get it on March 28), which is the same day as issue #5's expected release.

Section Zero #4 AUG001203   11/01   12/29
Section Zero #5 OCT001310   12/22   03/30
Section Zero #6 DEC001226           03/30