I just made a post speculating about the purpose and size of the different batches.
Regarding the moulded case, my assumption is that, because they didn’t write Dogwood + molded case, this means that the final version will have the actual body of the phone made using a moulding process, as opposed to a milling process. I’m not sure I like the sound of that (quality issues abound with metal castings, in my experience) but we’ll have to wait and see. I’m assuming it will be a metal case… but I guess we weren’t actually promised that?