I did a quick translation on the Test Phases Calendar from the JP website:
Network test Round 1: Online Mode Test (Japan Only)
(Sun) 21:00 to 22:00 scheduled September 29 1st test / 2013
Test connection target area : Only in Japan
Network test Round 2 : Server verications (Each region individually, depending of timezones)
Saturday 21:00 to 23:00 scheduled October 12 2nd Test / 2013
Test connection target area: Worldwide (Each Region Individually)
Network test Round 3 : Simultaneously worldwide test with everything running.
(Sun) 16:00 to 19:00 scheduled October 27, 3rd Test / 2013
Test connection target area : Worldwide target (all area simultaneous connections)
Server load verification illusion by simultaneous large-scale log in from all areas, blood stains, blood character message, such as server load verification summoned by asynchronous online elements, such as intrusion, server load verification and the online element synchronizations.
*Result of a strict lottery, only those who have been selected will be notified by e-mail:
*Results be sent to the e-mail address that you registered on Sony Entertainment Network and only for the account who it was selected to (sign in ID).
*If you have been selected for the first and second lottery rounds, you are still capable of test participation subsequently.
*People that were not selected in the first and second lottery may still win for the next lottery.
*Functions are equivalent during all three tests
Source (Translation done by Google Translate, then me fixing errors).
http://www.darksouls.jp/networktest/schedule.html