Ubisoft has big plans for the show and this year looks to be a great one for the company. The following games will be at the show that are announced right now:

• Watch Dogs 2 (Platforms Unknown)
• Eagle Flight (VR)
• For Honor (XB1, PS4 and PC)
• Ghost Recon Wildlands (XB1, PS4 and PC)
• South Park: The Fractured But Whole (XB1, PS4 and PC)

We will be doing extensive E3 coverage, so stay tuned for more information as we get closer to the event.
Source: NeoGaf & Gematsu 

Press Release on the Games Follows:

Eagle Flight (VR) – Official Website
Developed exclusively for virtual reality, players will soar over the skies of Paris as an eagle and experience the freedom of flight. Players take on enemies in fast-paced multiplayer battles for up to 3v3 or level-up flying skills in single player to navigate their eagle gracefully through the city’s most iconic landmarks.
For Honor (PS4, XBO, PC) – Official Website
Developed by Ubisoft Montreal, For Honor drops gamers into the chaos of a raging battlefield during an ongoing war between three Great Factions: the bold Knights, the brutal Vikings and the enigmatic Samurai. For every battle, players can choose which warrior they want to embody amongst the unique Heroes from this pantheon, using their distinct skills and weapons to fight for land, people and honour, decimating all soldiers, archers and opposing Heroes who stand in their way.
Ghost Recon Wildlands (PS4, XBO, PC) – Official Website
Set a few years from now, Ghost Recon Wildlands lets players lead a team of Ghosts, a four-player U.S. Elite Special Operations unit, on a covert mission to eliminate the Santa Blanca drug cartel, an underworld power and growing global threat within Ubisoft’s imagining of an incredibly beautiful, yet dangerous Bolivia.
South Park: The Fractured But Whole (PS4, XBO, PC) – Official Website
Delve into the crime-ridden underbelly of South Park as the New Kid, players must harness their super powers to fight crime and become part of the most beloved superhero franchise of all time.