A) I'd expect an open beta to have the most egregious bugs worked out, all features present, and that it'd been released as a beta for balancing and to work out the rarer bugs.

B) Not this high. Gazius went for .8/.9, but the last few missing features (unit cards, Sabaen troops, etc) keep me from putting it that far up. The balancing and bugs have been fixed to get it to this point, but I think that those should have been reserved for fixing after beta release, with the initial focus on making sure everything's there. I understand that the fix for recruitment in 1.5 delayed .8 a lot, but I'd put this at around a .7.

C) Beta, for reasons above.

D) That something drastic had happened among the development community. A decision that EB is good enough "as-is" and that development should start on porting to MTW2, or a major shake-up in the mod's administration. Something big.

E) I doubt it. RTW is a fairly old game at this point, and anyone interested in playing a mod would have heard of a mod with EB's scope. Most people, I think that the premise would have piqued their interest enough to check out the gameplay, look at screenshots, etc, and if it didn't, well, they probably wouldn't be interested in EB anyway, irrelevant of status.