DPReview has posted RAW photos from the new E-P3 for comparison to Panasonic's m4/3 cameras and Olympus' earlier models. Regardless of what some internet commenters have said, the results from DPReview positively support DXOMark's result of the E-P3 having the EXACT SAME SENSOR as previous Olympus cameras. There is no discernible difference between the E-PL2 and the new E-P3.
While Panasonic's GF2/GF1 is the lord of noiseland, the new G3 and the GH2 both widely outperform the E-P3 in noise levels. There is a large difference at ISO-1600, and an enormous difference at ISO-3200. Teh internetz r not amuzed.