Please take this as a rumour because I have no idea whether it is a prank, or whether it is the genuine item!
Today I received an email containing photos, which the sender claimed were of the GH2’s new 18MP sensor. The photos were sent to me from a source claiming to be at a factory (although he would not say whether it was in China or Japan) and look to have been taken with an iPhone (you can see a faint outline reflection of the outer edge of it in the 2nd photo). The sender removed any EXIF and GPS data from the photos – obviously the GPS data would be a big give away as to which factory – even which office – the photos were produced in. If the source is genuine, this would have caused him some problems.