Must be rooted
Must be loki'd
Must run a custom recovery or using a loki-fied recovery
Everything that I know of!
Are there bugs?
No IR Blaster
Some people are reporting GPS issues. Two possible fixes:
Turn off "Wi-Fi & mobile network location" in Location access setting
Grab a GPS lock on a touchwiz rom
Possible bluetooth disconnection issues
Changelog can be found HERE
Screenshots can be found in Post #2