Ok, just read the post in oficial site.

Even reading that was confusing.. SO this confusing system only rewards those who get at the top? so why... i... this is completely illogical.
So.. i was blocked from doing arena because of 2.0 since small server and most were already over (waiting more than 2 hours for a battle) and i get punished by that? Seriously.. sorry, feeling to say a certain F word. This is ridiculous.