The new figures in the JLU line for the Legionnaires will be coming out May 15th, according to mattycollector.com. They will only be available online.
View the pictures on mattycollector's Facebook page, Toy News International, and Major Spoilers.
According to Major Spoilers,
The 4-pack goes on sale on May 15, and while no pre-order or pricing information has been posted, the Justice League Unlimited Gotham City Criminals Action Figure 4-Pack sold for $30.00.
It'll be Brainiac 5, Lightning Lad, Saturn Girl, and Cosmic Boy. Here's a sample: