More evidence confirming the development of a new IS coupe has emerged with news today Lexus has registered a number of new names for the forthcoming model range with U.S. and Canadian patent and trademark offices. The new coupe will carry a ‘C’ designation tagged onto the end of the coinciding sedan model name, starting with a new IS250C, followed by the IS300C and IS350C.

The inclusion of the new IS300C also reveals Lexus is planning the introduction of a new model in between the current IS250 and IS350. According to my.IS, this could mean the introduction of the 3GR-FSE V6 engine from the GS300 sold in Japan and a number of other markets.

There was also no register of the ‘CC’ moniker, which would suit a new coupe-cabrio version with a folding hardtop that has been spotted testing recently.

Pictured above is the special edition IS250X sedan launched in Australia, which went on sale earlier this year in a limited run of just 450 units.