I'll do something crazy and be a constructive Slashdotter. Whether or not parent is trolling, at least other readers can glean some information. Hopefully I'm not completely full of shit...
"Android" is just the name of an operating system that employs the Linux kernel, the same as "Ubuntu" or "Slackware." Also like Ubuntu, it is financially supported and actively developed by a parent company. It is unique in its ground-up adaptation and optimization for battery-powered mobile architectures, as well as its display manager and development frameworks that are all designed from the ground up for low-resolution touch screens. It is also unique in its widespread use and endorsement among many hardware manufacturers.
The implementation of Linux in the context of this Spark tablet is also tailored very much for that hardware, and that is just an inherent beauty of Linux. It is using a version of KDE that is modified to be more friendly for the touch screen, but probably not as intuitively as Android's environment. I am seeing regular K-applications in the demo for this unit which are typically mouse-and-keyboard oriented. Out of the box this tablet probably lacks the necessary libraries and whatever other software capacities may be needed to run an Android application. However, that is not impossible and in fact I would be very surprised if somebody doesn't set one of these up to be able to do so. It will probably just be unintuitive...