Nikosandros
Golden Procrastinator
I'm not sure which preview you're referring to, because the rules are explicitly not like this. While there are some numerical bonuses, the vast majority of powers are about "breaking" the rules: moving and full-attacking, casting a spell without expending it, etc.The preview they showcased a month ago was something like "add +10 to all your 5th level character's rolls. Now he's Mythic!".
Has anything changed since?