Synthesized answer
The provided passages do not contain information about what questions remain unanswered in "The Red Book."
The passages only describe "The Red Book" as a large, illuminated volume created by Carl Jung between 1914 and 1930 as a result of his extended self-exploration [1]. It also mentions that the book was previously only seen by a handful of people, but is now available to scholars and the public in a complete facsimile and translation [1].
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: The red book = by Carl Gustav Jung Description: When Carl Jung embarked on an extended self-exploration, the result was "The Red Book," a large, illuminated volume he created between 1914 and 1930. However, only a handful of people have ever seen it. Now, in a complete facsimile and translation, it is available to scholars and the general public.