This ereader runs Android 4.0 on a 1GHz CPU with 512MB RAM. It doesn't have audio, but it does have 4GB internal storage, Wifi, and a microSD card slot. The Saga also sports a 300ppi 6" Carta E-ink screen with frontlight and touchscreen. Weighing in at 190 grams, it measures 9.5mm thin and packs in a 1.5Ah battery.
This ereader was originally developed by an unknown OEM, possibly the same one which made the Booq Cervantes, or the Tolino Shine 2HD. Based on its specs I would bet that this is the same hardware as the Shin 2HD, albeit with a different shell.
But that is just a guess, and if we went by the software we would reach a different conclusion. As you can see from the product images, it's running different software from the Tolino models, and according to one of the user reviews on the Slovak Telecom website, the software on the Saga is far from complete. That owner reported that this ereader is running poorly configured software which can't even support PDF (leaving Epub as the only supported format).
But there aren't all that many reviews, so it's hard to tell whether that is a software issue or a PEBKAC issue.
If you'd like to find out for yourself, you can get the Saga from the Dibuk website. It retails for 139 euros, or about 20 euros more than the Kindle Paperwhite.
Thanks, kuzelnik, for the tip!