May I ask how you know they are titles we have no idea of? Unannounced in general just means something that hasn't been said yet. in terms of E3 2014, FFXV and KH3 has not been confirmed for E3 this year. Nintendo has Bayonetta 2/Smash Bros/X are coming this year... yet they aren't displayed as showing up, heck not even Zelda U ( which is on IGN's front page). isn't on there list. Unless it's one of the 4 games that are "unannounced" to show up.
I am not saying it won't be new titles it could be very possible, but it could also be titles we know about just SE covering it up and not announcing it will be there until June 9th at Sony's Presser (perhaps)