Yeah. Perhaps I am disappointed because I don't really care about adventure mode. I know that there are tons of prereqs for the Army Arc, and many can be found in 0.40 as well, but because of the Adv. mode focus in 0.40 + the slow development speed [nothing new in this case, it was always slow, since it's a 1 man project] and the new dev plans [for this year?]....it will take years to see any serious Army Arc features to go live....as a "fortress mode only player", I am a bit pissed, but oh well, patience is a virtue, they say.
I think the point is that Toady wants to make Adventure mode something worth playing. While Dwarf Fortress is a pretty good "city-management-defense game", it probably isn't the best. Toady's ultimate goal is to make it much more; an entire "fantasy world generator" that you can interact with through either individuals (Adventure mode), fortresses/cities/settlements (Fortress mode), or through Legends if you just want to read about it. Fortress mode is only half of his big picture, though it is the half that is considerably more developed at this point. In fact, this quote from the development page suggests that he considers Fortress mode mostly done, and that he will mainly be adding "fan-suggested improvements" once he finishes with his current four-release plan (job priorities, inns and taverns, non-player artifacts and fortress starting scenarios).
The idea for the much-neglected adventure mode is to focus on facilitating some specific roles that should be fun by themselves but especially when taken together. The named roles are for planning purposes only, not for use in the game explicitly. Dwarf mode will see a round of fan-suggested improvements as well as interaction with the upcoming adventure mode villains, raiders, etc.
Dwarf Fortress is one big feature creep, but we all hope that it will be the best feature-creeping game ever when Toady finishes it in 2030.