By looking at what is going on with possible competitors for the Nissan IDX, we can speculate a bit about what that may mean for the Nissan IDX when it comes to production. Who is the competition? I'm going to talk a bit about the Subaru BRZ and the Kia GT4 Stinger.
The IDX concepts are said to run on 1.2-liter and 1.5- liter engines. No word on what horsepower they create, but what people are really clamoring for is the Juke NISMO RS's turbocharged 1.6-liter I-4 that produces 215 horsepower and 210 lb-ft of torque. Using that engine should allow the IDx to keep up with BRZ.
The Subaru BRZ is due to get a second generation soon. The current model uses a 200 horsepower, 151 lb-ft 2.0-liter H-4. Fans are asking for a more powerful version in the second generation. I believe that Nissan will be able to react to whatever Subaru puts in the next BRZ in order to make sure they are keeping up with the horsepower standard in this niche segment.
It won't keep up with the Kia GT4 Stinger though, which runs on a 315 horsepower turbocharged 2.0-liter I-4. This vehicle looks sportiest to me, and another thing that really sets it up as a competitor to the IDX in my mind is its use of door handle straps instead of traditional door handles, just like the IDx. Of course that engine is in the Stinger concept, so it is possible that the production version will have a less powerful engine.
The small, rear-drive segment seems like it is picking up steam, and now companies will be jockeying with each other to come out with the model that will lead the segment. The BRZ has the advantage of already being on the market, but Kia and Nissan have the advantage of reacting to Subaru, and learning from its mistakes.