Try to help us & invite old clans and players back to 2.5 and about this great community and there plans. 
Not to be a downer but has anyone actually said that work will be done on 2.5? My understanding about this thread is that it's just talk and ideas. I think what needs to happen first is the players themselves need to show interest and motivation for an "AA Classic" to be brought back. There's been several people that have put a lot of work (most notably, Jonny) into trying to keep 2.5 alive and interesting. As far as I'm concerned, all the efforts have failed to keep a significant user base. I mean, someone mentioned a server of 20 people? Even 50 people isn't worth the time and effort to rebuild AA.
What we need (IMO):
Someone knowledgeable in UScript - I don't imagine Berry (Crusade) is available much anymore. There's TONS of coders for UT2004, or at least there used to be. There's got to be someone that would love the opportunity to do something unique. I actually know someone that loves UT and is learning C++, that might pan out interesting.
A decent version of the UnrealEd engine - What we have isn't meant for 2.5, it just happens to work.
A way to form an authentication/tracking database - Some interesting links:
http://forums.epicgames.com/threads/522253-Uscript-MySQL-Classhttp://ut2004.titaninternet.co.uk/forums/showthread.php?t=15293It would be cool to talk to some devs and beta testers to see if we can get a hold of some files. It might also be a good idea to look into the old hackers that made honor hacks, they might know a bit about how the authentication or player database system worked - enough to replicate our own.