Having seen the following video (and linked to it in my last post) I thought it had far too much info in it to just pass off.
Here is my overview of all the 'leaks' in the video;
Creative mode includes and option to fly when 'Jump' is double clicked (un-clear how to travel up and down at this stage?)
You can set game mode per player! Notch: 'so you can set it per player in multi-player, having your mods as creative mode'