Lethality, what is the formula?

Hello, I have a simple question, does anyone know what is the exact formula for lethality? I checked one on surrenderat20.net but it was stated that it's just a temporal one and a subject to change after testing is done on pbe. With the new patch incoming I'd like to get a better understanding of how it works such armor, mr, and so on which are known and because these things are never in patch notes I'd like to ask if anyone knows or if any rioter coming by could shed some light on this matter? Thank you very much. PS: Lethality replaces armor penetration completely, correct? -- well I guess that's two questions.
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