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As usual we have hear very little from Panini about their next Fortnite Card Release. That is until a couple weeks ago! This notice has been passed around giving an expected release date of 9/22/2021 for Fortnite Series 3 Cards.
The only other mention of Panini Fortnite Series 3 is from ToyWiz where they are accepting pre-orders for the new set. They seem to be listed for 4x-6x the retail price which is pretty expensive for a pre-order.
You can see the pre-orders in the following links if interested.