same ^. I don't tell my lab anything and just let them develop normally usually. I've done this for a roll where I experimented and shot all over, ISO wise, and gotten the results I want. I think of the new portra this way: overexpose and you get the creaminess that was inherent with NC, underexpose and you get a little more punch in contrast and color like VC had.
My initial experiments with it were somewhat less than scientific however I think I determined well enough for myself that this film can handle anything I want to shoot color negative for.
There was a strange phenomenon though, something I haven't seen before: On only one of my rolls that I shot at 800-1600 there were huge color shifts. Things that were lit with fluorescent were magenta. It was odd because I have shot portra 400 at 800 and 1600 before without problems.