The PlayStation 4's exclusive racer Driveclub may be released on April 9, if a message reportedly tweeted by developer Evolution Studios is to be believed. While I couldn't personally verify the tweet, a PlayStation Nation user called 100mph has posted a screengrab of the studio supposedly tweeting the date, which was then allegedly deleted.
The tweet reads "Mark your calendars 9.4.14." It's believed, that since Evolution Studios is a British-based developer, that the date refers to April 9 rather than September 4. Unfortunately, I couldn't verify the tweet's legitimacy and Sony would not comment on rumor or speculation.
Driveclub was originally planned as a launch title alongside the PS4 in North America, but was delayed to "early 2014." Since then, we've seen numerous dates pop up as possible windows, including the latest from PlayStation Official Magazine Italy which points to a June release.