Gonna break the trend here and mention something other than the armor pen.
What's the deal with Force of Nature? It's been a standard item of mine for most of my tanky melee dps, to tank through more burst and help against being kited. The few MR items being introduced in this patch don't seem to be oriented towards champions that I play, Riven, Renekton, Rengar, Wukong, Darius, etc. Characters like Riven and Renekton seem to be hit even harder, as Banshee's is less cost effective when you don't need mana. What changes, if any, can I expect to see coming to help ad bruisers?