How much support?
I love to watch casts of SC2 games. I don't even play SC2 but I like and understand the game enough to watch. With the apparent desire of the community to cast games (Arkanti, NS2HD, etc), I think support for a more exhaustive spectator mode will be a great way to encourage these casters. (Spectating first person commander mode sounds awesome) NS2 casts with a good spectator mode will be a HUGE asset in stirring up interest in the game with non players and players alike.
So I guess my three questions are:
How robust of a system will the spectator system be? Will UWE be able to implement an HLTV-type system for NS2? Any demo/replay support?