Better “security” and “voice quality” (the way I interpret those words) are core features of the TeamSpeak platform which don’t require the new client version.
The beta TeamSpeak client basically uses the same security features and audio codecs as the old client generation. You don’t have to wait for those. You can start using TeamSpeak 3 right away.
The only things you would miss out on at this point are the new UI (but you can install third party themes in TeamSpeak 3) and the new global chat features.
Also, the current server generation is still version 3. It’s the same server you would use with a TeamSpeak 3 client. The way you set that up didn’t change.
The “easy to setup” free TeamSpeak servers you are probably referring to went through some testing but are not currently available. See this thread.
