Following the receipt of an invitation, it's believed that that the previously announced Battlefield 4 will be set for a worldwide reveal on the 26th of March at GDC 2013.
EA announced a few weeks ago that Battlefield 4 was in development for next-generation systems, such as the PlayStation 4. It's also assumed that it's in development for Microsoft's next system.
The invitation was received by Polygon, and it states that EA's DICE studio will be unveiling Battlefield 4. It asks the media to "please join us to celebrate a new era of Battlefield."
Check back nearer that time for more information about this story.