This really is a huge release, the speed improvement is very good indeed.
The passes are also excellent, though I have some ideas:
1. The ZDepth pass probably doesn't need to be 3 channels (R,G,B)
2. The Indirect passes contain the HDR environment, which may be the intended result?
3. None of the beauty type passes contain the alpha in their respective alpha channels (maybe copy the main alpha to them or just don't include them?).
4. Could we have the option on the passes node to merge/flatten/consolidate each passes' channels into one EXR channel? I use Fusion for compositing and it only wants a single combined Material ID/zdepth/position/etc channel rather than 4 components.
Basically, it's great but there could be way less channels to deal with!