A document publicly available via the internet - gawd bless it - has ignited speculation that a revised-hardware PS3 is in the pipeline.
It's revealed in the document that Sony has made an application requesting 'a class II permissive change' to the console to the US Federal Communications Commission. It's suggested by the changes detailed that a version of PS3 with an 80Gb hard drive will be released to live alongside existing models.
Alterations - i.e. update - to PS3's Bluetooth antennae are additionally related to in the document.
It's likely that any revisions to PS3 hardware would be minor and applied across the board, with a new 80Gb model simply being that - a PS3 with a bigger HDD. We'll just have to wait and see.
Sony declined to comment on the matter when contacted earlier.