I'll admit I don't really collect DC figures, or superhero figures in general, but the sculpting on these DC figures are really fantastic. The toys are solid and the likenesses are uncanny.
Check out this really great Black Mantis action figure. He's one of the villains of Aqua Man.
Two different versions of Deathstroke
They also had some smaller, articulated action figures on display. I'm not sure if they are exactly 3 3/4 scale, but they are pretty close.
For the younger set there were DC Super Friends - kid-friendly superheroes. Check out Aquaman's sub. the sculpt is awesome and it features diving action for the tub!