I recently gave a talk on Flash Professional CC and CreateJS for Adobe and WebProfessionals.org. Slides and recording are up!
Recording Link: http://seminars.adobeconnect.com/p1kqnaqlwzx/
Also: What?!? Flash Professional CC will target the Dart language from Google??? Crazy talk!
Incidentally – it seems the 404 error encountered with the PreloadJS example is INTENTIONAL to display this sort of handling :)