Watched this video:
https://www.youtube.com/watch?v=4lOpNajx3xI
The Ubuntu Mobile product manager says, its a normal ubuntu with the same codebase, only another user interface, so i think there are all the standard linux things running, like dbus, pulseaudio, etc...
My english is not the best but i think i have heard that normal desktops applications will run too and to adapt desktop apps to mobile ui will be very very easy.