I am making a patch for Underground.
If you want to help with it, contact me at http://l2jmobius.com/forum/viewtopic.php?f=21&t=747
Some people already help to finish some basic stuff.
Things that need to be done:
-There is some new SoulShot system, over the skills bar.
-When you enter game there is a reward window (new reward system?).
-When you logout from game there is info for what you aquired during your play.
-Geodata.