IS250C, IS300C, IS350C正式在北美註冊商標了

沒錯，就是雙門版的IS。
http://my.is/forums/f41/isxx0c-upcoming-2-door-lexus-gets-name-359710/

United States:
IS250C: Application No. 77448695
IS300C: Application No. 77448728
IS350C: Application No. 77448711

Canada:
IS250C: Application No. 1391370
IS300C: Application No. 1391371
IS350C: Application No. 1391376

不知道未來還會不會有IS-FC