well, we have generic guard and marine voices, and i'll do the chaos ones...
why not try some marine and guard characters.. or orks maybe... dunno what we'll do for necrons but I'm sure we won't have voices. We might have some kind of mechanical noise or something...
Necrons have a errie robitic tone don't they?
Well I know atleast it won't be an Ahnold "I'll Be Back" as they hit the WBB rules again and again ; )