Considering the 2010 Prius is the single best selling car in Japan right now, it will not be long before you see 2010 compatible versions of those watches.
Hey, I was serious. Until you guys started making fun of me Cry::hurt, I had always thought that the SKS feature wouldn't work unless the physical key was inserted in the SKS fob. So after wiping my tears, I took the key out of the SKS fob and went down to my car to see if the SKS would work with the keyless SKS fob. Lo and behold, I was able to open the hatch and then lock it again by pressing the black square. Who knew? (Not me lol.)