That's not a special release channel, it's a change in the way releases are made and distributed for different parts of the world.

Strange that, I've got 7 machines on site, all in the same office. All of them running the same software. Non of those have updated to the "beta" version?

Firefox 34.0.5 is most certainly not a Beta version as it has been the current Release since December 1st. https://www.mozilla.org/firefox/34.0.5/releasenotes/

There are four main development channels. Release, Beta, Aurora and Nightly. It is version 35.0 that is currently on Beta channel (at 35.0b2 currently) and not 34.0.