Personal Book Builder in Logos 4.x

ref: http://www.logos.com/4/missingfeatures
In regards to Personal Book Builder being implimented in the 2nd Qtr of 2010, the missing features page says:
Personal Book Builder (Improved to use the native book format!)
What does "Improved to use the native book format!" mean to me in regards to:
(1) Importing documents/resources created/authored for LDLS 3.x.
(2) Maintaining old and authoring new resources in L4.x?
Thanks for your consideration
Living in the Fruit of the Spirit! 
For the glory of God alone! 
Comments
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its so long since I used v3 I might be wrong:
in v3 you couldnt highlight your pbb, or if I recall add notes, those will be possible in v4 for starters..
I am sure there are other things that others will recall
as for the old and new - we have no definitive answer yet - PBB is still in design stage for v4 as I understand
Never Deprive Anyone of Hope.. It Might Be ALL They Have
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