Unfortunately this is how it was created from the very beginning - there are no separate channels for public and private chats. The issue has been forwarded to the developers, and they are working on a solution.

We appreciate your feedback on the recent regional match making changes, and we see that it’s mixed: some people consider it as a real improvement, for others it increased the match making time. At the moment we are not going to readjust neither the Game Center ping limits, nor the regional matchmaking pop-up timeout as the migration of Brazilian players is still ahead, and we want to ensure a comfortable gameplay for everyone. We also expect that the NA and EU merge will improve matchmaking in the Asian region.

It’s still to be decided. Currently, we are adding some additional offers like “Swarm” Collectors Editions to provide the Marketplace with new items.

You can see our future plans in the Roadmap which includes development of both community suggested features and a brand-new content.  

No.

Name change is paid to prevent abusing or make the investigation of EULA violations easier (such cases as account trading, stealing, in-game cheating or scamming etc). Most games have it as a paid service (with an existing cooldown).