According to the official news, Update 1.1.5 was released in this morning. New skills such as Ball Lighting, Vaal Lighting Trap, Vaal Righteous Fire and Spell Echo have been added to the game. At the same time, the balance and bug fixes are made in this patch. If your build is Ethereal Knives one, your cast speed will be increased by 25%. But the damage will be decreased by 20%. See more balance fixes in the following picture.
In the following video, new skills, path of exile items and gameplay changes will be teased here
1. Vaal Lighting Trap
The shock stack is quite useful to attack the high life/lighting targets. At the same time, the game can lasts long enough. It is a situational 30% boost to DPS in coordinated parties. The gem will work well with GMP, LMP and Increase duration. It is really overwhelming skill gem.
see the full article Path of Exile Update 1.1.5: Ball Lighting, Vaal Lighting Trap, Vaal Righteous Fire Spell Echo, Some Balance and Path of Exile Items Are Available in New Patch