It turns out more Lee Sin buffs than originally expected are coming to League of Legends with Patch 13.3.
Additional changes to the Blind Monk’s E were found on the PBE servers by data miner Spidexe. These updates will buff his E base damage to 35-150 and reduce his AD tio on the ability from 110 to 100 percent, but it will scale with total AD from the next patch—not just bonus AD.