There seems to be some confusion about the Phone Mode windows that are for apps that are designed for a phone sized screen. They of course would not be adjustable they are the size and shape of a phone screen. I wonder if the can switch to landscape?
The specs don't include gryo or GPS so it would suggest productivity apps are the target.
It might be that the Ultra Tablet is really just to showcase the Remix OS and the aim is to validate Android as a serious replacement for MS Win. because it can be used for 'real' work, not just games and social networking or videos.
The main thing MS Win has had over all others is standardization, Remix OS on ROM could deliver that. Chrome OS is is on that path too but has a way to go.
UNIX LINUX based systems keep that toolkit style that while flexible and configurable as a plus that also is a minus for standardization. The last thing a workstation user wants to hear is boilerplating, they don't want their system locked down so round and round we go.
Remember when IBM offered 25 million lines of source code free to members for OSF 1?
Plus another 15 million lines for OSF 2 that would add features to support POS (point of sale)?
I do, but instead of one version of OSF 1 we had five, non-standard except for the base kernel, because no one wanted IBM to tell them what to do.