[TYPO3] TYPO3 4.0 and new book?

[Frank Sonck]

Hello,

I'm thinking of buying the book "TYPO3: Enterprise Content Management" but
since Typo3 4.0 is being launched I was wondering whether a new version of
the official book is also planned and when. Would anyone here have
information about this?
Do other books exist that are usefull?

Thank,
Frank