I saved my 2nd batch of WG weekly quests and did them Monday night around 10pm to test if they get reset regardless of the 4 day timer on Tuesday morning. The result? They were reset at 3am along with the rest of the dailies.
This is what I got for this week. Offensive quests were not available to me at all after doing the defensive ones in between the two days where I did the dailies. I did Wintergrasp at least twice a day everyday this week except for Saturday.
09/02/2009 00:58:22 Stop the Siege
09/02/2009 00:58:28 Slay them all!
09/02/2009 00:58:31 Victory in Wintergrasp
09/02/2009 00:58:44 Toppling the Towers
09/02/2009 01:05:39 Bones and Arrows
09/05/2009 23:46:17 Bones and Arrows
09/06/2009 00:11:49 Victory in Wintergrasp
09/06/2009 00:11:54 Slay them all!
09/06/2009 00:12:09 Stop the Siege
09/06/2009 00:12:16 Toppling the Towers