They recently announced that FFvsXIII will be released episodically, so I think there's a rush to finally get it out the door.

But Yoshi has only mentioned trailer for XIV.

I believe vsXIII will be playable but I'm not so sure about 2.0. It would be smart to have a small environment built specifically for a hands-on E3 demo. The best way to get the word out that it's a better engine and better design is to let the journalists experience it. But I have a feeling it'll be just a trailer.