I want to give Lexus credit for how the exterior looks and for the work that was put into the suspension, but among it's competitive set, this IS is a hard sell in the mass market. The comments we've seen about Lexus "considering" an IS 500 with V35A-FTS have to be a joke... if Lexus was going to drop a new engine option, this would have been the day. Next month or next year is not the time considering the lifecycle of this car. V35A-FTS has now been around for long enough that it could have been included in this launch if that was in the plan.
in the long interview that is on Lexus global, they did hint about possibility of more high powered engine. It might be coming in winter as supposed to be announced now (and on sale in fall).
However, unless there is some crazy good price on it, It feels to me that I have to repeat this often - it is base engines that sell in this market.
Everyone talks about M340i and similar, but people dont buy these. Here is current stock of new 3 series in USA:
Since this is very extensive refresh, i think their main deal eventually would be to offer competitive lease rates as well as good looks. But yes, Lexus lovers will like it as well. I am talking about people who buy NX and RX, not just ones that liked IS-F and GS-F.
How many sales per month? Depends on their target and how aggressive they want to be.