The main changes are that I have removed most of the custom UI elements which in the end didn't work so well and reverted back to standard system components.
I spent a lot of time using it in meetings and presentations and figuring out what didnt work in the previous version.
The map space now matches that of the OS X version so if you are working between the two via iCloud you can seamlessly view you maps on iPad and OS X
So for example when you touch a node you get a familiar iOS Menu for any actions related to it.
The same goes for links
Theres camera support and bookmarkable audio.
Have a look at the manual here...
Ive also made the relationship viewer a lot more solid and useful.
So take it for a spin and let me know what you think