Viper Strike doesn't get benefit from the new nodes. That's too bad. :-(
Wow that is huge if you are referring to the Chaos Nodes I'm assuming.
Not only Chaos nodes, but also DoT nodes should affect Viper Strike. It clearly states in the description:
Inflicts a debuff on the foe, which deals Chaos Damage over Time [...]
So, it's Chaos and it's DoT.
I didn't make any test yet, but both should work on that skill or those nodes has no sense at all (except maybe DoT nodes for igniters). Has anyone tried it?
I did not try DoT but the Chaos % Damage and Resistance nodes. The Resistances showed up in the defence overview. The Chaos % Damage neither in the Offence Overview nor changed the chaos base damage over time in my Viper Strike Gem.
I really hope this is only a bug. If not ... then I don't know what that means.