Could somebody who really knows about these things explain what chipset Nokia is using? What differences it might have to for example OMAP3430. This ARM11 based at least seems to be very good at saving battery looking at the figures given by Nokia.

Nokia and Qualcomm had chipset project for Symbian phones where we would see results in mid 2010. First from Nokia to support ATT and T-mobile 3G bands make me think that Qualcomm is indeed behind this.