This new system will provide six slots skill, two kinds of the time you start playing, and the others will you get from level up your character. There are 5 types of runes with a particular skill. You also can choose 3 kinds of 12 total Passive Skill. And skill calculator is only up to level 30 for now, but Blizzard said it would raise the level cap is up to lvl 60 in the future.
Diablo 3 Skill Calculator : http://us.battle.net/d3/en/calculator
