Surely 16 GB of RAM seems wildly optimistic in this day and age for an e-reader, even a very hypothetical one.
It sounds like a potentially better colour device than what we have now, but it also sounds like a rather unrealistic (for the next few years at least? how close is Gallery 4 to reality?) wish list.
Bookshop.org is US-only, I think, so not of any actual use to me in any case (I’d assume that even with their open Android etc, if the store is US-only, they wouldn’t market or sell the device internationally either).