Judge for yourself (at the end of this clip):
So yeah, that looks like they're going out on a high note. By the way, the clip above is set for this Friday's episode of Smallville, but they could very well introduce the LOD by the end of the episode. Want a closer look?
Clockwise from the top right; Black Manta, Captain Cold, Roulette, Metallo, Dark Archer, Solomon Grundy, with Toyman on the screen in the table's console.
If you stopped watching Smallville, these next two weeks are the time you should start watching again. Why? It's the series last two episodes.