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We also got a bunch of information from an interview that Brick by Mind is posting now that Lego's officially announced everything.
>Confirmed all 16 realms merged
>Imperium are from one of the other realms
>Sora is also from the Imperium
>Zane Cole and Jay will return, the cast will be rotated out from seasons going forward with only Lloyd and Arin and Sora being permanent main cast characters, will include more new ninja in later seasons
>Rising will be serialized, last multiple years with an overarching story.
>Episodes are back to 22 min length, will be split into two batches of releases, latter half in the Fall
>Ninjago Core has been canned, main series is the focus