There have been a few leaks about the next in the Gran Turismo series over the past few months. We first heard that Gran Turismo 6 remained a PS3 game back in February. Then a listing for the game on Sony’s current gen console appeared last month, followed by a release date of November 28 and box art. All that was speculation, though, and today Sony has announced it intends to tell us exactly what is going on with the series next week.It’s actually been 15 years since the original Gran Turismo appeared for the PSOne. So a 15th anniversary Gran Turismo event is set to be held on May 15 at the Silverstone circuit in Northamptonshire, UK.Sony and Polyphony Digital are promising to not only look back at the series, but also look forward. Kazunori Yamauchi, CEO of Polyphony, will be present to make “some exciting announcements” about the future of Gran Turismo. I expect that will include details and footage from Gran Turismo 6, but also something for the PlayStation 4.Ideally, Sony would love to have GT6 released to keep PS3 sales strong this year as well as having a quick turnaround for a PS4 GT game for release in 2014. Polyphony isn’t exactly reliable when it comes to release dates, though, and development time is counted in years, not months.The good news is you don’t have to figure out how to travel to Silverstone in order to hear what’s going to be said next week. Sony will be live streaming the event via gran-turismo.com and the PlayStation.Blog.