Sprint and HTC delivered invitations to the media on Tuesday evening for a joint event that will be held on April 4th in New York City. Sprint CEO Dan Hesse and HTC President Jason Mackenzie will both be on hand, and while the subject of the event remains a mystery, rumors from earlier this week point to a flagship device launch. A report on Monday suggested that Sprint is planning to release the HTC One X on June 10th, and the sleek Android 4.0 phone could very well be the focus of next month’s press conference. The One X would be among Sprint’s first LTE-enabled devices, and it features a dual-core Snapdragon S4 processor, a 4.6-inch high-definition display and a class-leading 8-megapixel camera powered by HTC’s dedicated ImageChip. BGR will be be on hand to cover the event live on April 4th.