The IS-F is only temporarily dead. I thought I read an article on Autoblog a month or so back that said the Lexus CEO had signed off for a new IS-F to be built (with no specific time table).
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There will be an IS-F IMHO. They have the power train and drive train readily available. And the IS chassis doesn't differ much from that of the RC. All they would have to do is to add more aggressive exterior components to make an IS-F happen. Plus Lexus would need to have a M3 competitor anyway. I really don't see why they would pass on this opportunity.
2014 IS350 AWD F-Sport Premium Atomic Silver/Rioja Red