Yup, works with the new version.
For the other thing: no clue why you can't simply leave the original as it is, and copy the materials 1:1 to the new platforms, but you probably know better...
One other thing that cam to my mind, BTW: since there is already a feature for scaling the assets during atlas creation, why not offer kind of "Auto-Platforms", where you can scale down automagically from a 4x to 2x/1x platforms, also creating the required lower-res assets? Is it just because of teh anchors? I think this is in most cases not really a big issue...
Regards, habitoti