Honestly, I tried to find the first week of GW and with the multiple postpone I am a little bit lost 
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I think is this one: Guild Wars Delayed (April 24th) so April 24th.
So yeah you’re right: this week we began the 5th cycle and not the 4th (mistake of mine) 
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If we do a full cycle, the next cycle should begin December 4th. But nobody said that we have to do a full cycle (i.e. 6 weeks).
The initial target was 3-6 months, we are there.
And the next GW troops are in the game files since few months so I don’t see what they are waiting for…
If some devs can explain what it’s going on, it could be nice. @Saltypatra, please?