Yeah I agree, why not a 2.4 liter? I think basically they didn't want to make as much or more power than the v6 engine, which makes sense from a marketing perspective, but makes no sense from a performance/demographics perspective, since it appears the four cylinder will be the engine of choice for many tuners. Then again, maybe we'll see a bunch of twin turbocharged v6 Genesis coupes driving around!
I also am glad that the manifold is not a one piece design like the SRT-4. Allows for easier upgrade path, and like you said, cheaper to boot. I was disappointed that there was no information on what type of turbo (the manufacturer of the turbo that is) used in the Theta TCI engine, other than it uses special metals and has a 3D type wheel. Knowing the flow characteristics of the turbo by knowing which turbo it is would help to know what are the theoretical limits of the stock turbo (how much can you boost and at what RPMs to make maximum power). Knowing from experience that the SRT-4 uses a ridiculously small turbo for the engine size, yet people are still able to squeeze out over 300HP on the stock turbo... it seems that this turbo appears in the pictures to be a bigger turbo, which may be able to produce similar numbers before upgrades to the turbo are needed. At this point I think the transmission is of greater concern to me. See my post in the transmission performance section for what I mean.
I wonder if the ECU will be easily progammable by the aftermarket like the Evo, or will it be a pain up until recently like the SRT-4. Not that you can't get around such things, but it definitely is easier to make more power if the ECU can be reprogrammed.
One correction to your post though, most stock SRT-4 boost between 11-15psi. Depends on the climate and such. But that confuses me, how could Hyundai come out with a 2.0l boosting much less and make almost the same HP as the Dodge? Maybe the CVVT makes up for some of that, maybe better efficiency, maybe Dodge is underrating power (they are).