Yeah, it's true. While some companies do make announcements here and there... It's mostly about tech and developers talking about software engeneering/game design. It's actually much more technical than it sounds.
E3 has basically PR people talking about how great their games are, GDC is more about meetings with software devs and such.
Yu Suzuki's part in it, might be interesting... But a post-mortem is basically discussing what went wrong, how the project came to be, who worked on it, where was it going,etc,etc...
Probably very technical...