Anyone knows whether there will be biuld-in voice communicator in game or players would have install other programs for this (TeamSpeak, Ventrilo etc)?

It's still very early days and as far as we know there isn't a built in voice chat program.

I dont think they need to do so, since there are excellent specialized programs, that whole gaming world use anyway

If there is I'll definitely turn it off, ruins immersion for sure and is usually ruined with idiots playing music or screaming or speaking in some unknown language from whereever. If your guild is dedicated enough they should have a vent/TS/mumble-server for group-play.

If it was done really well, I would like it in the game. I helps let me chat with people in pugs. Problem is, most of the time in game chat programs svck. I think the only good one I ever saw was DDOs.