The interface layout has changed since the article (although this specific article doesn't mention interfaces, a later article in the series does). Additionally Go now has generics.
It's true that little has changed, but very little is changing in the data representation of any language, really. Even ones that are evolving rapidly.
This is a truth that's easily overlooked; most languages are several levels beyond basic types to the point that people forget about the low level constructs involved. This is one reason why I like Go, it exposes and educates on fairly low-level mechanisms that are not unfamiliar to anyone who's studied computer science, but at the same time you don't have to worry too much about the lower level stuff like memory, pointers, zeroing, etc. I think it's a good tradeoff.
