I'm 100% sure the Linux version will come out this semester... here's why:
1. There is an early access program already in place for Evernote on Linux, they are testing it already on Linux, it is a reality.
2. They are still stabilizing the Windows and Mac versions, as soon as those 2 are in a better shape, the turn will come for Linux.
3. The pace at which these updates are coming makes me think the time for Linux will come very soon.