I tested one for a limited about of time this past fall (didn't have much time between when the sample arrived and the onset of cold weather, and I almost never have cause to use a WPB jacket Nov-March). Details will be published in a sub-8 oz WPB jacket SOTMR in a month or two.
In short, it's a good jacket. The Hood adjustment is improved over the original, though it could still be better. The coating seems lighter, and is not plasticy on the inside like the the first generation.
The Helium II with have strong competition with the Rab Pulse, which uses very similar fabric, has a very similar weight, identical features, and a much better hood for 25 more bucks MSRP. I found the Pertex fabric on both to be clearly better than the rest of the light PU jackets (stood up better to abrasion, more durable DWR).