Sega has confirmed at least four of the titles it will be showing off at E3 2014 next week. They are, in no particular order:
Alien: Isolation (PS4, XB1, PS3, 360, PC)
Hatsune Miku: Project Diva F 2nd (PS3, PS Vita)
Sonic Boom: Rise of Lyric (Wii U)
Sonic Boom: Shattered Crystal (3DS)

Maybe there's still hope of some secret game reveals, right? Maybe Sega is just keeping quiet about a new Shenmue or Yakuza and they'll surprise everyone at the show with these reveals... right?