A few different comments I have seen on various gaming related websites people have claimed it is the PS3 version as that is what the button prompts are. One dude even said a developer confirmed this on the Rockstar forums. I asked for a source, if they share it, I will do the same.
I personally think it is from one of the two console versions. They make a point of saying it is all gameplay, so I really do not think they would "dupe" anyone by showing gameplay from a dev kit. I have faith it is from one of the actual console versions. The million dollar question is which one.
EDIT- Confirmed. This gameplay trailer is the PS3 version.
Again, taken from the Official R* Website HERE.
Good news for PS3 owners. Looks like it is a decent enough version at least. With GTA IV I thought the 360 version was the (slightly) better version (I actually played both).
The comment you quoted was for the screenshots released two months ago.