Yeah last week took the wind out of everything. It's also almost 3 weeks till this starts. Feels like they might have pushed out the news earlier to recover. Normally they haven't been announcing the new season till like the day before.
There was 1 Deck of Whispers card that hadn't unlocked and it was time gated. It unlocked at reset and people found it in Alters of Summoning. It unlocked the final Imbaru puzzle, which led to a final cutscene, and this tweet.