Hi @contact593,
What kind of information are you seeking? Not much has changed in terms of multiple displays, except for Apple requiring apps to utilize the size/resolution of the iPhone5 screen, but I believe that’s been covered in previous tutorials, and here:
http://docs.coronalabs.com/guide/basics/configSettings/index.html
http://docs.coronalabs.com/guide/distribution/buildSettings/index.html
Best regards,
Brent