Is 152 pages really enough to detail the whole setting? I doubt they can use all the 4e classes, so new classes, feats, mutations, guns, vehicle rules, Gamma World creatures, etc, etc... all in that short a space? I don't know.
Yeah, I was thinking it might be a good basis for a "John Carter of Mars" style science fantasy setting.Could have some good crunch to transplant into a sword/planet campaign.