Hi all. Hope it's OK to post this here. I've just released a post on wpandlegalstuff.com called "How to apply the GPL to your themes and plugins (and avoid getting in the shi*)". Its aim is to make life easier for developers who need to deal with the GPL-related legal stuff prior to releasing their products. It gathers together the GPL requirements and the WordPress.org requirements and has a GPL Engine people can use to build the legal content for their style.css/plugin file header, readme.txt and license.txt files.
I don't know how many developers, Theme Review Team members and Plugin Review Team members are on WP Chat but if you're one of them, are reading this and have a bit of spare time to take a look at the post, that'd be super awesome. I've done my best to be comprehensive but you know the old adage, "you don't know what you don't know". So if you spot anything that's amiss or have suggestions for improvement, I'd love to hear from you please.
All the best.