[UPDATE] Following the publication of this story, The Verge also reports that Microsoft will hold a press event in April to announce the Xbox 720.
The original story follows below
Unspecified developers and "industry professionals" have informed CVG that Microsoft will announce the Xbox 720 at a one-off event in April. This is later than the rumored March event and would notably take place after the 2013 Game Developers Conference.
In addition, a "senior Sony official" who asked to remain anonymous told the site that the PlayStation 4 unveiling this week "at first caught Microsoft off-guard." This person added that, "We definitely ruffled some feathers."
Microsoft spokesperson Larry Hryb--aka Major Nelson--took a shot at the PS4 event this week. Writing on Twitter, he said "Well then. This meeting is running a little longer than expected," followed by "Announce a console without actually showing a console? That's one approach."