Insofar, the game-changing Wikipedia has been a phenomenon that required you to have access to the Internet. This did not limit possibilities, but allowed you to keep up-to-date. However, there are those who would prefer to use it without having that kind of connectivity. This is early, but now it's possible.
You have an application that works on Win32/64 or GNU/Linux-32/64. The core is written with Java, this would seem to have facilitated their faster dual-platform support and hence a prudent choice. I appreciate their not having stuck to mingw by first having had a native GNU/Linux application which would permit them to uniformly tune user-experience on multiple platforms.
Click the link above if you're among the impatient lot, and would rather dive right in and find out what it is.
For more details, you'll have to continue reading.