Sega will be at PAX Prime this week, and they're bringing the new Sonic game with them! Lost World will be playable on the Wii U and 3DS. I'm actually interested in seeing this one, as I'm hopeful there can be at least one good Sonic game this generation.
What else? Well Total War: Rome II, Castle of Illusion Starring Mickey Mouse, Hatsune Miku: Project DIVA F, and Heroki (a new action title for mobile and tablets) will all be playable too.
Sega also tends to give away some cool swag items, so it'll definitely be worth swinging by their booth at PAX.