This was something I only recently noticed about the file headers.

When XMB v1.9.8 was released, for some reason it was packaged with a copy of GPL v3, but kept all of the GPL v2 file headers.

This hasn't changed since then.

The obvious choices are to revert the copy of GPL back to v2, or update all of the file headers to v3.

Since v3 is newer, is there any reason to not just go with that one?

Update the file headers to match the current LICENSE file, since I'm guessing it was a longstanding mistake.

The contributing team back then presumably agreed to change the licence to GPLv3 and it'd be more hassle contacting them all to make sure reverting to GPLv2 would be in their wishes...

It was agreed to move it to GPL v3. The headers were oversight and mistake with 1.9.8 that was isolated. Just stick with GPL v3 as it was what the team agreed upon. vanderaj and myself kind of pushed the situation to the forefront with support from other at the end and we implemented it completely. It was the 1.9.8 intro of code and minor changed by me that introduced the header mistakes.

Nice to see you pop in and clarify things, John. I guess that settles the answer.

Hope things are going alright for you, it's nice to see that XMB veterans still lurk after all this time.