So I've found all sorts of useful information through Wikipedia's entry on Xenosaga, some directly and some indirectly.

en.wikipedia.org/wiki/Xenosaga

The two items that I found most interesting were:

1) The entire story of Xenosaga is vastly different from what was originally planned, because Squaresoft still owns the rights to everything in Episode V (Xenogears). This means that rather than keeping Xenogears as Episode V, the Xenosaga team will almost definitely do a complete rewrite when they reach that part of the story. I think it's cool that Episode V will get a facelift, but it's also rather sad that this means we will NEVER see the complete series as it was originally intended... all because of Squaresoft.

2) Monolith, the team behind Xenosaga, is currently working on a strategy/action/rpg/something game, Namco vs Capcom, which is to include characters from MANY games by both companies including Street Fighter, Ghost and Goblins, and yes Xenosaga. Promotional images I've seen include KOS-MOS, Shion, and Momo.

www.monolithsoft.co.jp/