The QTS side operates in the normal manner, providing shared folders and such for the benefit of networked users in the home (we will say home users as these models are not business-focused). However, the TAS-168/268 feature a HDMI port, meaning they can simultaneously be plugged into a television set (and there is support for 4K UHD!). When you do so, what you see on the screen is a desktop version of Android. Android provides access to thousands of apps of every possible nature. Want to browse the internet with Chrome? Watch a movie with Netflix? Play a game? You can do all of these things, whilst the unit simultaneously serves up files to other household members. Being Android, there is tight integration with Google, so access to your email and Google Drive files is there.
It gets better. The TAS models come with a nifty remote control, but you can also plug-in a standard USB keyboard and mouse (or maybe a wireless set), at which point you have effectively got a normal desktop computer, albeit one that runs Android rather than Windows.
It's possibly fair to describe these new models as 'experimental', inasmuch as they are trying to drive the NAS market in new directions plus, of course, provide market differentiation for QNAP. But they are certainly innovative and QNAP may just have put their finger on the button.