3MP camera on P990i is not only difficult at this point (specs released all over and production presumably about to start / well under way by now), but also quite pointless given that its primary focus is being a PDA phone, not a camera phone. Yes, it's good that SE upgraded the camera of this P-series model but I wouldn't expect them to go all the way with the camera features, because that's not the point of the phone ("nice-to-haves" vs. esential features of that particular market). It will only drive up the cost even further upon what is no doubt going to be very expensive as it is.
As for the M600 vs. P990, isn't it a bit... pointless to compare two phones that no-one (except SE employees or a few lucky reviewers) has even held in their hands?
I mean, sure - you can compare the design and feature list, but ultimately you need to really compare the phones in person to make a proper comparison. Non-headline features/touches, tactile aspects and software bugs won't become apparent until people start using it fully either.