I have just found out that collector's edition is shipped with 3 months TeamSpeak Voice Hosting.
So, yes, you can use third party voice comm programs in GW. <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />
PS: As for me, I have checked, no authorized retailers ship into Estonia. I live in a f*cking isolation <img src="/ubbthreads/images/graemlins/disagree.gif" alt="" /> So, can't pre-order it.
"Endure. In enduring, grow strong."
-Githzerai adage.