It appears to me that this is just that a different, high-res set of images has been used for Indiana (and other areas that appear the same color). For instance, check out this Google Maps image, which has New Jersey and Massachusets similarly "off-colored".
What I want to know is, why does Indiana only have the high-res on this new service, unlike those other two states, which have it on Google Maps as well? As a Hoosier, I'd appreciate being able to see my city in greater detail than these "green-images" which transforum whole blocks into black-green smudges. It's almost like an old-school Game Boy.