Im not sure where to get it/how to use it/what it is. I saw one on this website but im not sure if it is the correct version. So where would i get one, some guy on a server got me interested saying it had new features. Please send some info on this!

You might take a look at this thread: http://forums.alientrap.local/viewtopic.php?t=3887

Thanks, but what exactly is it?

Hmm, this sounds great, when i get time, ill look at it. Thanks for this information.

you should probably wait, a new release is just around the corner.

2.5 MAAAAAN

Let's get it oooon

Well there is rumor about an upcoming feature freeze.. usually there have been forum test-releases then

And while i think Z's explanation is good, i want to add that SVN is just a way to organize code or more general different version of files. The game is stable but its still fun to change further, to improve and make it better. The Nexuiz team uses svn to organize the Nexuiz files and thus 'svn' generally means the current state of the development of Nexuiz.
Now and then you (re)pull the files or their changes from svn and thus get the spearhead of development.. Which will sooner or later reach a point were the devs agree its all good and well and deceide to warp it up and release as a new version.
Generally svn is nice to see whats going on but to keep confusion down only people that know what they are doing should bother with it.. (ofc nothing is wrong with tesitng if one knows enough )