Here is the reason why I think so:
1) iPod with color screen cannot be only for music... and movie on such small screen are of no interest, the only reason for the (far) future color iPod is to display still pictures (and a 40 GB HD will be a good extension of any still picture camera).
2) iPhoto is not only a picture viewer, but also a link to several services (mostly print services)
3) I am quite sure in a near future is will also be able to buy images from iPhoto on the iPIS (iPhoto Image Store)
4) and therefore the $$$ will ask for a PC version of iPhoto
QED
1) iPod with color screen cannot be only for music... and movie on such small screen are of no interest, the only reason for the (far) future color iPod is to display still pictures (and a 40 GB HD will be a good extension of any still picture camera).
2) iPhoto is not only a picture viewer, but also a link to several services (mostly print services)
3) I am quite sure in a near future is will also be able to buy images from iPhoto on the iPIS (iPhoto Image Store)
4) and therefore the $$$ will ask for a PC version of iPhoto
QED