Most of the look changes of KitKat on the Nexus particularly - the transparent status bar; the white vs. holo blue network icons; the new dialer; the new launcher - are *NOT* part of the Droid update. The look remains the same as under Jellybean.
We have a thread that detail some of the changes that we have noticed here: OTA KitKat update
The official list from Verizon is here: http://support.verizonwireless.com/dam/support/pdf/system_update/droid-ultra-maxx.pdf
Among other things not listed there, there is now a settings->home to set the default launcher if you have a third party launcher installed; a default SMS setting in settings->more (under wireless & networks). There was an update to the Assist app today to improve driving support for KitKat phones.