I think its safe to say that iBooks and iTunesU, will be coming to OS X. So Books and iTunesU content will be gone.
Also i don't get why iOS Apps sync with iTunes (now that iOS is its own ecosystem). So i wont be surprised if Apps are removed as well / hope so.
So this only leaves Music, Movies, TV Shows, Podcasts witch is perfect!!
I think "The main focus seems to be on iCloud" Will be all Purchases (Music, Movies, TV Shows) will show up in the Library with the little cloud icon next to it if i want to download it, just like when you have iTunes Match but applies to all content you buy in the iTunes Store.
Also i hope they get all my devices talking on my local network 'better', for example; If one of my devices (Mac, iPad, iPhone, AppleTV) has a Movie or TV Show Im watching/downloading (on another device). It should get it from the device on the local network before "iCloud"... its stupid downloading a 1080p Movie or TV Show from the internet when its on my Mac to feet away.