Yes, you are correct KOrganizer, KAddressBook, etc have been moved into Kontact. However, they are all still individual applications, Kontact is just a gui wrapper for all of them.
This release currently only synchronizes the To-Do list with KOrganizers To-Do list (same as Kontacts To-Do list). Note, this is NOT a silly one way sync or anything like that. This is actual synchronization with full conflict management controls, passcode authentication, etc. Adding Address Book and Calendar support is nothing really.
I however need this tested so I can find the problems before implementing Address Book and Calendar (both which are very easy and should take a very very short time to implement). I just need testing done. I know most people use Address Book more than To-Do but I use To-Do all the time hence, why I implemented it first.