I do have a question, what is the meaning of the white skull and cross bones that comes up for all classes now? Does it denote a kill i have got or a taunt or what?
It is called Vendetta. Izzy's can place this mark / debuff on enemies, and they will take increased damage from Izzy. She can also consume these Vendettas with various skills, converting them into Elusives (the coins you see) and interact in other interesting ways too.
The most basic combo is Bolt for Vendetta, Spin-to-win for Elusive, and extra damage.
Each stack of Elusive will absorb one hit from an enemy, and can provide other effects with Izzy's passives from speed to not taking dot damage ever while Elusive is up.