Take Two has launched a placeholder website called Citizen Skywatch, suggesting an imminent reveal.
According to Fusible, Take Two registered the domain in April, but the placeholder site has only just gone live.
The website's address information matches that of Rockstar. Now, what well known series is Rockstar very strongly believed to be working on right now, which is notorious for its AR marketing including websites for ficticious organisations?
Grand Theft Auto V has was rumoured for reveal prior to E3 but failed to show. The usual whispers haven't suggested a possible gamescom debut, and Rockstar tend to keep a low profile at the show, so don't get your hopes up.