I am pretty sure the mod will be released to a public beta before all the civilopedia entries are complete... and all help with entries will be appreciated at that point. Right now, there are only basic descriptions of each entry and we want a full, detailed entry for all before it is made official.
I think Weasel Op is the only one whom has had a crash in a while... every game of mine has been fine for some time. I'm sure there will be some found in a public beta, however.
There are 7 mannish civs --> High mannish (Numenor, Arnor & Gondor), Middle mannish (Northmen & Rohan) and Low mannish (Easterlings and Harad). Harad and the Easterlings have completely unique unit lines and I am trying to add more variance to the middle and high lines. Each civ has a lot of different units available to them. Isengard is a completely unique civ and more of a hybrid.
Seperating other similar civs in gameplay and units is also on my list -- Angmar from Mordor; varying the elvish civs, etc...
CamJH is helping us with a few units to fill in some of these holes

Olorin has also started to pick up unit making!
I have been going through the numerous ships out there and earmarking them for certain civs to give the navies some variance as well.
We are a little shy of Wonders in the second age to early third age, so we've been trying to find a few more there to add and what bonuses they sould give.
As of right now, the Nazgul are not a part of the mod. I'd like to see them incorporated and we are discussing a few ways to do so. We'll need graphics for these at some point (Utahjazz may do a Nazgul on horseback sometime in the future and I am hoping we can convince Aaglo or even Supa to do a Winged Rider for us). The darkened inquisitor and darkened wyvern rider will serve as placeholders in the meantime.
That's the stuff I am involved with. The actual modding is in PCH's hands and I'll let him and mrtn comment on that if they care to. Those two are continuously working on updating the buildings as well.