The rumor was first reported over at Superman Super Site and is one of many casting rumors currently swirling around the film. Bryan Cranston and Mark Strong have previously been rumored to be up for the role, though both actors have made it known that they were JUST rumors. This one seems to be pretty hot and with pre-production in full swing in advance of a January/February filming, it's likely there's at least some credence to this rumor. We will all find out soon enough.
Locke, I mean O'Quinn, is an interesting choice for the role. He certainly has the charisma and look for the part and can clearly do sneaky-underhanded-deceitful-while-making-yo- trust-him pretty well, and, as I've said before, that's most likely the Lex Luthor we will see in Snyder's universe. What's your take on O'Quinn as Luthor? Who would do a better job?