Update 11pm: added response from Matt Forbeck
You may recall earlier this year that the Battle Dice game from Playmates Toys was going to provide some Legionnaires in DC waves 3 and 4. Unfortunately, Playmates decided to cancel the game with Marvel wave 2 and no DC heroes will be released.
Here's the list of what was supposed to be waves 1-4 of the DC set. Livewire, Saturn Girl, and Cosmic Boy were to have been in DC wave 3, while wave 4 would have had Brainiac 5.1 and Ultra Boy (plus someone namd Thunder, but no idea if that was the Legionnaire, the Teen Titan, or someone else).
I asked the game's designer Matt Forbeck whether any wave 3 or 4 figures might exist as production figures or even prototypes. He replied:
I’m not in the Playmates office, so I can’t say for sure. However, I don’t believe any prototypes ever got back the first wave for DC Battle Dice. There could have been a few Wave 2 figures, but I’d be surprised to learn any Wave 3 or 4 figures were sculpted. Sorry!
For more on Battle Dice, check out Matt Forbeck's site, or the Popdice fan site and its forum.