I can confirm this is true. The resources are in the binary.

    iOS_TabBarIcon_Messages@2x.png
    iOS_TabBarIcon_More@2x.png
    iOS_TabBarIcon_NewsFeed@2x.png
    iOS_TabBarIcon_Timeline@2x.png

http://imgur.com/a/pVyiT

There's also a bunch of weird new stuff, like QR codes linking to people's profiles. In Messenger.app there's a disabled function that lets you message people that are physically close to you as well.