Slapping AV Watch's report through Google translate brings up the sentence: "'LX900 Sun June 10, according to the release, PlayStation 3 and update, 3D stereoscopic gaming titles to launch' he said."
The "translation", to be fair, might as well be in Spanish, but it has a date and the words 'PS3 update' in the same sentence, so let's call it speculation-worthy - unless there are any Japanese-speaking CVG readers out there who'd be so kind as to translate it to actual English in the comments field below...
Sony has confirmed plans to release a 3D firmware update around the same time that the first 3D TVs are due to arrive - which is this summer.