Portal 2 will have the same content across all platforms and the PS3 and 360 versions are "identical", according to Valve.
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PS3 users will benefit from Valve's Steamworks, which won't be available in the 360 version - whilst Xbox owners won't be able to join in cross-platform play between PC and PS3.
However, Valve writer Chet Faliszek told CVG that you won't be able to tell the difference between the content of each game itself.
"If you bought the PS3 and Xbox 360 versions and put them side by side you can see they're identical games. The actual content is the same too across all platforms," he assured us.
"With the PS3 we can update more often, we don't have to have someone else gate that ability. We can play between the PC and PS3 players because we can update more frequently.
"That's our thing, we don't want to hurt [either PS3 and PC users playing cross-platform] and now that we can update more frequently it's easier for us to avoid that."
"Then we added things like chat between the platforms [and] Steam Cloud for the PS3," he continued.
"Sony has been really great to work with; they've been really supportive and helpful for us to do this.
"So from that end as gamers we always look at what we would want and how we wanted it and on the PS3 we've been able to deliver a lot of the things we would like to see."
Valve sided with Sony and PS3 at E3 last year and confirmed cross-connectivity between PS3 and PC for Portal 2 earlier this year.
Read our full interview with Chet Faliszek to find out more about Valve's latest.