The GNOME HIG hasn't been updated in years and Allan Day found it time to update the guidelines in preparation for next month's GNOME 3.14 release. As explained by Day, "There is a downside to all the experimentation that has been happening in software design in recent years, of course – it can often be a bewildering space to navigate. This is where the HIG comes in. Its goal is to help developers and designers take advantage of the new abilities at their disposal, without losing their way in the process. This is reflected in the structure of the new HIG: the guidelines don’t enforce a single template on which applications have to be based, but presents a series of patterns and elements which can be drawn upon. Each of these is accompanied by advice on when each pattern is appropriate, as well as alternatives that can be considered."
Those wishing to explore the updated GNOME Human Interface Guidelines can checkout the latest gnome-devel-docs and Allan's blog post.