The "newest" thing in radar detection is band segmenting. On some of the higher end detectors you can actually specify what KA frequencies you want to to scan and drop the rest off the scan list. So if you know what radar the LEOs in your area run you can turn the other bands off and get way less false hits plus much faster reactivity because you detector has to cycle through fewer frequencies.
RDF Geographical Survey - Radar Detector & Laser Jammer Forum
Has a pretty good list.