40th Anniversary Edition 370z???

Crash

Yeah, not to mention that they're not going to make all those 3.7L blocks just for 3 years of models. The 3.5 was around for a LONG time. The 3.7L is going to be around for AT LEAST 7 years. They'll make improvements to the heads, cams, timing, intake, exhaust, etc but the block will stay the same (unless a big flaw is found that needs to be corrected like GM did with the LS1). The 3.8L will be sold exclusively to the premium cars only for a while and again, those will just keep getting tweaked by Nissan, rather than boared out.

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2002 Corvette Z06 - Totaled
2003 Corvette Z06 50th Anniversary

JeepZen

I believe the VQ37HR is basically a VQ35HR with a longer stroke. I don't believe they are significantly different designs so I don't think you can assume that they need to get the same life out of the R&D for the two models. Having said that, I don't think Nissan has a need to upgrade the engine for several years to come anyway. The power-weight ration on the 370z is pretty awesome right now. Adding another 20-30HP isn't going to make the car significantly better or faster.

I would love to see them work out a DI version of it, but I think fuel economy would be a bigger selling point on that upgrade than the power boost. The VQ35XX/VQ37XX goes into a lot of vehicles besides the 370z and Nissan is going to get a much more value out of +3MPG than they are with +30HP. The bonus with DI is that you can get both.