well, as beta tester, u will be playing the patch, BUT before u start typing yay and huzzah, know that this isn't just plain playing.
Your aim/job would be to find faults with the game, for example if u keep chatting with an npc and u noticed a typo, u have to report this and note this down
or if u choose a random set of action like atk, spell, def or whatever and something strange occur, a bug has occure
so as a beta tester, u be the guys finding fault with the game, instead of enjoying it, u be ripping it to shreads finding typo here, a glitch there, stuff like these.
and when u do find a typo, u have to contact the hacker in this case, psycoblaster(he might be there or away or hard to find) and telling him what bug u find, how did u encountered it?
For example, i am a beta tester, for example and i was walking around pressing L and R for no reason and i encountered an enemy, instead of one hit koing them, i waste my time casting debuffs and after the battle, somehow i can't see my character, then this might be a bug so i have to send a report to psycoblaster regarding it. Also, before sending this report, i have to try and repeat this once more, since it COULD be a one time thing, just like those random crashes.
so as a beta-tester, your job is very important as for me, i cant beta test, mainly cos well, my ds is messed up, battery screwy and all so, good luck on the project