Ah, I'm sorry, you are correct. In the month-old discussion at https://news.ycombinator.com/item?id=13865108 someone listed off the devices in this category (https://news.ycombinator.com/item?id=13865777), including two Onyx Boox units (13.3 & 9.7 inches). The Onyx Boox Max Carta should be available after the Hong Kong Electronics Fair - sounds like the same device but with a higher resolution screen.

The Mobileread discussion linked from there is >60 pages of discussion including staff from the company, and there's discussion of a Boox Max 2 coming out later this year that will have the higher-resolution screen, touch instead of pen, an updated (but still slow) processor, possibly a bump in Android version (still ancient, jumping from 4.0.4 to 4.4 perhaps?). Doing a little digging, the processor change may not be a processing power increase but a power consumption decrease (i.MX6 to i.MX7). Note that all of this is unofficial and that it doesn't seem like the details have been finalized.

I'll also note that (without reading the whole 60+ pages) I saw at least one person who'd also installed apps from the Google Play store and found that troublesome, particularly when updating the firmware in the device.

Edit: after a bit more reading on Mobileread there might also be a 10.3" version of the Boox ("Boox Note") towards the end of the year; they're taking prototypes to the Hong Kong fair to gauge interest but would likely not do mass production until October (https://www.mobileread.com/forums/showthread.php?t=285006)