Way too early to know these things. Boon has only confirmed the six trailer characters (Superman, Batman, The Flash, Wonder Woman, Harley Quinn, and Solomon Grundy) and that the roster will be "comparable to MK / somewhere in the twenties." The rest is speculation at this point.
Lobo is a Nu52 character now, considering he's appeared in deathstroke's book but he's now 100% Wolverine appearance wise. Ugh.
Why not use his design from Young Justice's TV show? that's a badass look. --- Metallo, Bane, Ares, Aquaman, Martian Manhunter, Orion, Mongul, Black Manta, Cap. Marvel, Cap Cold, Power Girl, Zod & Darkseid for Injustice: Gods Among Us