You can also check out older information about rijonAdventures in these older threads: check these out - the thread before this one, the old thread before the just-mentioned one or the first thread.
Christmas 2008 Beta release notes
The game finishes after the Elite Four campaign. It introduces many new areas to check out (and they will be almost the same as the final version, hence why this is a "beta" release). I recommend that, so people can enjoy this new beta a lot, that you DON'T transfer your save files over if you've played a previous alpha or beta. If you do transfer your save file, you'll notice that all of the Rijon region is unlocked. Goldenrod City is incomplete in this release, however.
If you want to give this a shot, check for bugs and glaring errors and report them in this thread if you'd like.