My prediction: a Spiderwick Chronicles campaign setting.
I don't think either of those qualifies as "little".Or a event what would allow the crossover between both franchises. Then Sigil wouldn't be the main thread, but it may appear within the story.
Forgotten Realms?Wizbro has zero interest in any campaign setting published prior to 2003
They've only published a a 5e book about the Remembered Realms, remember?Forgotten Realms?
They've only published a a 5e book about the Remembered Realms, remember?
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And what about Planescape/Sigil as next M:tG expansion?