PS4 and PS Vita, according to a recent tweet from Shuhei Yoshida, President of Sony Worldwide Studios. We've inquired with Sony PR for further details.
Cross-game online chat has been available on PS Vita since its launch, but the feature never made it to the PlayStation 3. With the launch of the PlayStation 4, which also supports cross-game chat, we can all finally talk to each other no matter what we're playing. But can we, you know, communicate?