Just to be clear, folks, there are not any plans (that have been revealed by Namco) to go past Xenosaga Episode III. What originally began as a six-game plan ended up being our current three-game trilogy.
It's a real shame that they did so badly with Episode II. I really wanted to see more.
Namco understood many people did not enjoy episode 2 so they included the summary of the events that happened in Xenosaga 2 within the Xenosaga 3 database. Xenosaga 3 does, in fact, bring back the balanced gameplay system of part 1 with a few tweaks to make it better, but nothing as bad as part two's battle system.
Also, there's a Xenosaga Anime that pretty much sums up part one and fills up a few holes in between part one and two.
Here's the link:
Anime News Network - Xenosaga: The Animation (TV)
This signature is within the limits upheld by the forum rules. Unless the rules change, do not remove.
As much I as would like to see that, it probably will not happen. If there is a part four it will be years later as a director's cut or something.