Leaked images of a new Sony PSP console
A new version of Sony's PlayStation Portable games console is expected to be launched at the E3 video games show.
Video and photos of the PSP Go have been leaked online, revealing a smaller, more lightweight console that has dropped the failed UMD disk format.
There have also been reports that Sony will announce a re-designed, slimmer PlayStation 3 but BBC News understands this will not be launched at E3.
The new PS3 model will be out later this year, BBC News understands.
Microsoft will kick start proceedings at E3 in Los Angeles with a press conference on Monday, at which the company is expected to showcase a raft of new features for its online games and content service, Xbox Live.
The PSP Go is said to be smaller and lighter than the current PSP models
There have been reports that Microsoft will show off a new controller that uses many of the same features as Nintendo's Wiimote, as the company tries to broaden the appeal of its console to non-gamers.
Sony is expected to unveil the PSP Go on Tuesday, following a number of high-profile leaks of announcements to come out of the firm in the last few weeks.
The most recent, about the PSP Go, came after an official video showcasing the new device was mistakenly posted to a Sony website before being hurriedly pulled.
In the video, Sony's John Koller said: "It's a 3.8-inch screen, it's 43% lighter than the PSP-3000, 16 gigs flash memory, Bluetooth support and all digital content so the UMD drive goes away.
"So it's going to be something a lot of consumers like - download straight to a hard drive."
A spokesman for Sony would not confirm the launch of the PSP Go but said any announcements would be given on Tuesday.
Industry leader Nintendo is expected to focus on new software for its popular Wii console.
It is also likely to announce the availability of its Wii Motion Plus device, which adds greater sensitivity and control to its controllers, along with games that support the add-on.
Nintendo needs a big show after last year's announcements were criticised for being lack lustre, and recent evidence of a slow down in sales of its Wii console.
Analyst Mike Hickey, of Janco Partners, told the AFP news agency: "Nintendo needs something; everyone is saying that."