Ubuntu store apps won’t work across mobile and desktop in 14.04
One of Canonical's main goals in bringing Ubuntu to mobile devices is to create a converged platform across smartphones, tablets, and PCs. As such, a developer should be able to write an app that has a single code base yet runs on all three types of devices, presenting a different interface to the user on each form factor.
Technically, this has already been achieved. Ubuntu Community Manager Jono Bacon this week showed off Karma Machine, a reddit client built by a third-party developer using the Ubuntu SDK: