I imagine Uncharted 4, Gran Turismo Sport, Horizon: Zero Dawn and God of War will be their flagship Neo flaunting titles, with a few third party titles sprinkled in for good measure. I don't see them debuting a new title, it just seems counterintuitive.
You really think they'll have such a huge focus on first party titles?
Granted I could see them showing off GT:S since it's coming this fall, but I think they will be focusing on Call of Duty, Watch Dogs 2 and something like FFXV I suppose, you know - the big blockbusters hitting this fall, and I think they will try to convince people why Neo is the 'best place to play' this fall.
And Titanfall 2 if they have marketing on that, not sure they do.
I doubt we'll hear much about Horizon or God of War at least untill PSX.