TSA officials insist they're merely moving the machines to smaller airports, because that will speed things up everywhere. A cynic might counter that putting controversial machines at smaller airports also means smaller controversy, and that this simple math might have something to do with TSA's decision. Either way, it's a shift.
As for what the next generation of TSA scanners will look like, assuming that the agency really has made a strategic decision to shift away from nude-o-scopes: there are at least two options.
The first replacements will probably come in the form of TSA's Gingerbread Man scanners, which we overviewed here and which the agency subsequently rolled out a few months later. There's already some proof for this theory. As backscatter machines were getting removed from Boston's Logan Airport, Gingerbread Man scanners were getting installed.
A little more speculative are the next generation of hackproof, super-effective scanners that Pentagon scientists are developing for DHS. These scanners will have cutting-edge technology with the ability to "identify novel signatures distinct from those typically employed in conventional X-ray" machines, the result being a "reduced probability of false alarm." So on the one hand, there's a reduced chance of an unnecessary pat-down, and that's good.
On the other hand, we're not sure it's a good idea to have DARPA - the kids who make killer drones that autonomously navigate across battlefields by talking to satellitesputting their skills at TSA's disposal. Will TSA agents be able to use whatever they're given correctly? Because the thing about TSA, you see, is that it's been known to more than once to screw up tasks and then lie about what happened. Someone's taking all that into consideration, right?