1, This UI contains many features, like auto loot, view and change attributes/skills/wpt/equipments etc., mix two careers to a extra career by using perk tree, and get extra build while hero is in high level.
2, Hero's career skill can only occur once a battle, and the rage(or angry?) skill can be used when the bar is full.
It won't be too soon, or too late :) 
Looks very interesting. I can't wait for the next version
Musou mode lol
I think the Yaksha mode is like a demigod mode, or like Saiyan mode in Dragon Ball