Yup looks like they are the only Tegra phones the world is ever going to see. All Windows Phone 7 phones are going to be SnapDragon (well, the first batch at least). iPhone is using SGX, Samsung has its own stuff and will porlly have SnapDragon based WP7 handsets this fall, Motorola is using Qualcomm & TI OMAP, HTC is 100% Qualcomm (only the Dopod Quilin is a TI OMAP 3XXX), Palm is dead, Acer is using Qualcomm, LG is also using Qualcomm now, and Nokia is SGX/TI-Omap/Qualcomm soon in the US, Sony Ericsson is using Qualcomm for their Android and WP7 handsets, and TI/SGX for Symbian.
nVidia is dead in the water in the Smartphone biz AFAIK. Funny to see Microsoft going 100% SnapDragon for WP7 and giving nVidia the finger after working with them on the Zune HD and KIN devices for such a long time. I guess that OEMs didn't won't to have anything to do with NV.
Full KIN specs here:
http://www.mobiletechworld.com/2010/04/12/microsoft-kin-one-and-kin-two-specs-unveiled/