I checked the most recent batch I received (and hadn't opened yet) and discovered the differences in appearance you had outlined. However, something looked very familiar, so I checked further. Sure enough, my suspicions were confirmed. The discs were actually manufactured by Mitsubishi Chemical/Verbatim.
Comparing the new Apple disc with a Verbatim-branded disc shows the exact same writing surface appearance. In addition, they have identical alpha-numeric batch coding identification and stamping font around the hub. I guess that increased demand has caused Apple to line up several supply sources.
Jeff Wildman