Yeah I've read the stuff on the internet about the new 400 stuff. I'll leave it at this: I think the new Portra 400 is a fantastic film and represents an improvement over 400NC, which was my most used color film. I'm very happy with the new stuff. At the same time, I feel like it's an incremental improvement, not a 'game changer' or revolutionary improvement like some people are making it out to be.
Here's a shot of the new Portra 400, 2 stops underexposed in tungsten lighting:
Portra 400 Tungsten -2 by ezwal, on Flickr
Here's a shot of 400NC, 2 stops underexposed, in tungsten lighting:
400NC Tungsten -2 by ezwal, on Flickr
While the Portra 400 looks a bit better in my mind, it's not much and it could be potentially due to differences in the scanning/post processing. (I didn't scan these and there was some inconsistency in the files from operator laziness). So, it's a great film, but it's definitely more like 400NC than it is different in my mind.