They've done it before with Patch 9.2 when they added both Season 3 and Season 4 Vicious Saddle mounts in a PTR build. Originally neither mount had a source listed, but later on, we found out that the Croaker was the Season 3 reward and the Wolf the Season 4 reward.
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While Blizzard has been very dismissive of any question about the future of Dragonflight beyond Season 3, there might be something in the data indicating an upcoming Season 4.