It doesn't look like too much has changed (so far) over last year's models. The biggest difference is that their entire line will now detect the Ku band. The Ku band is currently only used in Europe, but there are rumors that a radar gun manufacturer may be looking to bring Ku to the United States.
At any rate, these models will surely be popular with our European customers. Previously, customers needing Ku detection would have had to choose between the Bel RX65 and 995, both topping $250. Now, a detector supporting Ku band can be had for as little as $80.
As far as other differences, the new models are sporting a slightly different look. Cobra is also claiming improved performance in the 9730 and the 9630, but I'm going to wait to see some test results before I put that statement on the web site.
We're still waiting on the XRS-9530, XRS-9830, and XRS-9930 to arrive. The 9530 will be a 9500 with Ku band, but the 9830 and 9930 seem interesting. Both have what seems like it could be a revolutionary color display. Will post more details when they arrive.