Board Thread:General Discussion/@comment-3214109-20180524224745

There's a new canon Ninjago book coming soon called "Secrets of the Sons of Garmadon"

Summary: ''Discover the secrets behind Garmadon’s past and his rise to power as a super-villain! The world of Ninjago expands with exclusive stories and deluxe artwork that tie in with the latest LEGO® NINJAGO® TV series.

Book contains:

Exclusive world of Ninjago backstories Deluxe artwork World of Ninjago secrets revealed for the first time!''

So we will most likely get the SOG's backtories including Harumi's upbringing in the palace judging by the cover. 