Looks like it's their chip manufacturer, UNISOC, who got a little too eager in the press release. They wrote: "The phone uses e-ink
for its secondary back display and LCD for the main one." So yeah, it seems like they're all single display phones. Good that you noticed, pdurrant.
@stumped. We're able to get Google Play on the Hisense A5 for 10 euro extra,
as described here. Though I dunno if that includes the Google Services Framework, or whether there are any major issues with the tradeoff: no OTA updates. Assuming the new A5 models would sell well, we could very well see something similar, i.e. Cect Shop offering them for a premium with Google Play.