Watch Dogs 2 has long been rumoured and Ubisoft haven't really made a secret that it is coming. In fact, they gone as far as saying that it will launch this fiscal year (ending March 31, 2017) and with no Assassin's Creed this fall it stands to reason Ubisoft would want Watch Dogs 2 to fill that slot.
More fuel to the flames of a potential E3 reveal arrived on Twitter as YouTube profile theRadBrad posted a picture of a branded casing for a pair of Ray-Ban sunglasses sporting the Watch Dogs 2 logo. A gift from Ubisoft.
Now, before we get all upset about Youtubers accepting such expensive gifts and Ubisoft sending them, it should be noted that they don't come under the same scrutiny as journalists when it comes to these sort of dealings. Regardless, it would certainly seem likely that we'll see Watch Dogs 2 at E3.