Kontact 4.6 / KMail2

Is there any place where one might find some info on how the new kdepim 
is SUPPOSED to look and function? I have put out a query on various 
forums on what is the meaning and purpose of the folder structure in KMail2.

Being in my case:
KMail folders w subfolders containg all my old and new mail
Local folders w subfolder Outbox containing nothing
Akonadi_maildir_resource3 w subfolder Outbox containing nothing

Is this even correct after a migration, what is the point of the new 
"main folders" and their subfolders?

It works reasonably well - eg mail collection on pop3 does not chew up 
to 25% cpu any longer, nonworking mail accounts are now properly 
"nonworking". Only obvious bug I noticed is that Trash is not emptied on 
exit despite my having set it to be (since forever) and that on replies 
the signature does not get removed despite my setting it to.

Kind regards,
Sinclair
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