Originally Posted by CoolStoryBro
Should just be lights and a bumper.
From what I'm seeing in other threads on the forum there's a high probability that wiring harnesses and plug connections have changed as well.
I looked closer at one of the comparison pics posted earlier and it looks like maybe the rear quarter panels would not have changed. But it is known that the major parts that would be required for this swap would be the rear bumper, new rear deck lid, spoiler, rear diffuser, and tail lights obviously. Yet to be known is if there would need to be any wiring harness adpaters and such.
I guess by the end of the summer there should be enough '14s out there that I'm sure someone will have ripped into one enough to show what really is different.