This link should help answer some of the extended hours questions. There is a slight debate going on within that thread, so if you have any questions or concerns, feel free to contribute to that thread too! As I have been making my ADRs, I have been planning them based on the earlier park hours since I will be traveling with a 4 year old. Any extra hours added is a bonus for everyone else, but won't really impact us since we will be heading to bed at a reasonable time each night. The only thing we will monitor is the possible 8:00 am park openings at MK. Oh well. Back to topic and looking for those cancelled ADRs. Good luck everyone!!
http://www.disboards.com/showthread.php?t=2600964