Version 40 includes a few new elements. These include:
Stickman (STKM) - A playable character that can spawn any element. He only has 100hp so be careful with him. Heat and pressure can hurt him so keep an eye out for what you do
Insulator (INSL) - Stops all heat and electrical transfer
Switch (SWCH) - Allows current when charged with PSCN but not when discharged by NSCN

Due to the addition of INSL, FOAM has been removed from the list of elements.