Not sure I'd use the word "arrived" since I can't buy one and no one has tested it anywhere yet.
This engine has been rumored for years and though its obviously coming, I'd be surprised if the hemi is not available in some trim/option/package for another few years yet anyway.
The key is going to be fuel economy. If it can't increase that by an obvious and significant amount over the hemi then there is no point to this engine to me as a consumer I'm just going to pass on this engine (obviously Ram needs the engine because it will help them with emissions but that doesn't affect my purchasing decisions in the slightest.)
In other words; this engine is great for Ram, but not necessarily great for me as a consumer. We will see, I will consider one if they get it right with no turbo lag and a obvious improvement with MPG (and not just tricking EPA tests either, real world results!)