Suicide Squad is a nice Start... more villains that aren't necessarily Batman related. I recently received a loose Deathstroke with two additional random swords... and wild Deathstroke can whore himself out to other Heroes, he can still be a Batman villain by association... Titans enemy, Robin is a leader... boom! I've made fun of most of the two packs since they are all Batman related.
Where's Luthor, Bizarro, Solomon Grundy, Gorilla Gr... wait they made Grodd! Finally! A Non-Batman villain.
My previous 15 DC characters that McFarlane should tackle only saw 2 make the light of day. And it was mostly due to Batman.
Guys like Luthor, Cheetah, Sinestro, Reverse Flash are obvious choices... Let me try to get away from those... and try to keep the guano to a minimum.