Hang on... we DID have Beyond as well which looked fantastic. So what, Ellen Page saved the Sony conference
Although as @Aimless pointed out there was stuff coming to the Vita, it was all "40 games" or an announcement of a game rather than a demonstration, bar the one, and that isn't what Sony needed to do to regain the confidence of people surrounding the system.
Is it possibly a Japanese saving face exercice? Nintendo have done similar things in the past, where they just refuse to mention the war.