One senior Sony official, who asked not to be named, said he was informed that the PS4 showcase in New York had "at first caught Microsoft off-guard".
"We definitely ruffled some feathers," the person said.
It is said that Microsoft will now showcase its console at a one-off media event in early April - though it is expected that discussion about future tech would be an inevitability if Microsoft engineers and developers attend GDC in March.
[UPDATE: Microsoft partner Ustechs, which has worked with the platform holder on previous media briefings such as the E3 2012 press conference, has registered the domain XboxEvent.com (as explained on NeoGAF)]
Microsoft has declined to comment on its next-gen plans ever since rumours began two years ago.
Sony revealed the PlayStation 4 at a New York press conference on Wednesday.
The PS4 release date is set for "holiday 2013", likely across Japan, Europe and the US.
