Judging by how long season1 and season2 lasted, how long should it be until we have season4?

Seasons have and will likely continue to match PvE progression. There's always the possibility of starting a new season and not adding new items of course, but as we have Sunwell coming a season 4 and upgraded items to match Sunwell item budgets are an inevitability.

There's no rule that says a season will be a specific length or will include new items.

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Q u o t e:
The heck? 'Morn and all Drysc, but it's rather early for a Blue :-p

Could I borrow some of your coffee?

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I'm not where you think I am.

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Q u o t e:
soon

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I'll be slightly more descriptive than Drysc. Not very soon. S3 rewards have quite a bit of life left in them before they start to feel obsoleted by pve gear.

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Q u o t e:


LOL.....please, please, please release a Season 4 Arena and don't introduce ANY new gear.

Then I think you will have a VERY good indication how popular the Arena is on its own merits.

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About as popular as a Sunwell without any loot in it?