Now I have gold account and i've read, that i can try out the beta version. where do i find it?

The beta version of the navigation is available to all users now, not just Gold.

You can change to it here.

Beta version of what?

The navigation was recently only available for beta testing to GA users, but now everyone can use it. I don't think anything else is only beta testing for GA users right now? Might be wrong, there might be a battle feature.

There isn't anything new to test at the moment.

ok, sorry, i didn't knew that yet. thank You all.