I've got some initial feedback for you after playing around with the new version of the extension.
First of all the 'add content to power cms' feature that you need to select prior to installing the cms worked fine for me in this build.
However, before trying the new version of the extension I deleted the dreamweaver cache file and received an error message (see attached image). I deleted everything and started again, this time not checking whether the cache file had been deleted or not - and that worked without any problems. I then deleted everything a second time and then deleted the dreamweaver cache file - again the error shown in the screenshot appeared so it looks like if you delete the dreamweaver cache file prior to running through the installation wizard an error occurs.
I've only created one single page so far, but I've added multiple editable content areas on that page without any problems. I've also edited the content for these regions in Power CMS and the updates have been applied correctly.
Apart from the cache file bug I encountered this appears to be a much better build. The installation wizard ran fine, with no issues at all.
[Update] - I just tried adding an image to a content area. This worked fine in the editor itself. I resized the image without any problem too. However, when I then returned to Dreamweaver and chose - reload content it downloaded the new content but the image didn't appear - I got an empty box with a broken image icon in it.
If I find anything more I'll update you.