Using proximity voice chat will make linebattles much more fun. Being able to talk to members of other regiments would be nice, and officers can communicate much more thoroughly. Not to mention, if anyone plays ARMA, the use of the taskforce radio plugin for TS could make things even more interesting.
As for public play, voice chat could be a bit more fun on a NA1 kind of server, but there will be a fair share of cancer as well.