Wait, are you for real? I mean, that could perfectly be Auron (which I'm not sure of, but wouldn't be suprising because of his posture and the collar).
But that's just an easter egg for now, like the "Aya" one. Nothing else. No proof whatsoever of X-3. And hey, I think X-3 will probably made sooner than later and if it's done, Toriyama has the biggest chances of directing it. But even that it's also a bit blurry as (someone correct me if I'm wrong) he stated that his game would be revealed this year.
Unless he works on various games (smartphone games... or even VIIR, for example), no way X-3, if already in development, is revealed this year. That is, it could be a relatively small and low-budgeted title, but even then... Also, didn't you also think Toriyama was VIIR's Event Director? lol.