As much as I'd love a Parasite Eve 4, I know there's next to no chance of it happening since I heard the rights reverted back to the PE book author.
A FF7R E1 and KH3 trailer and release would be great, we'll almost certainly be getting those. I'd also love some new footage of Shadow of the Tomb Raider. Oh, and I hope like hell we get to see the first footage of the Avengers game from CD. We have no idea what the plot is yet, so I'd definitely be looking forward to that. That might actually top my list of games I'd love to see in SE's showcase.