My interest is hobbyist and to explore new use cases.
It's sounding like it'll run webOS, but you'll need a Bluetooth-compliant keyboard to run it effectively. Interesting, nonetheless.
Does anything think is a serious vector for webOS to gain footing through a ton of people buying this device, or is it just a hobbyist pursuit? And how will you run games on the device when most require touch-based input (having near-zero consideration for external input devices), much less an accelerometer in other cases? Or will this be a case where webOS merely acts as a productivity-based platform with the apps it has left in its roster to this end?
That's the problem with moving a purely touch-based OS into a purely external input-based realm; you lose almost all interactivity with a vast majority of the apps its users came to rely on due to developers not building those capabilities in.
Bluetooth is built-in, as is micro USB, standard USB and HDMI. Touch interface may be a challenge, but then the same challenge exists with Android. Gaming accelerometer and/or touch input could be provided by a handheld peripheral (Logitech Revue and Sony Google TV mini keyboards are examples). Other than printers, we have no idea what use cases HP might target for Open webOS.