Giffs as skins in Fortnite confirm... oh, sorry!
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I see WotC is very interesting to recover old IPs, but I guess the true goal is not selling more sourcebooks really, but to promote the different sub-lines as "brands", because today the market strategy is to use an IP to sell different types of products.
I wonder about the insectares. The original metaplot had got some "secret" and this could be an obstacle to design insectares as a PC race.
What about the bionids?
Other point is Spelljammer being used to play a mash-up of their favorite sci-fi franchises. And why not?