You can view the first episode of Young Justice online at Cartoon Network's official website.
Right now I give the series 3 out of 5 stars.
It doesn't have the flashy style of either Teen Titans or Batman: Brave and the Bold. However, the less cartoony art may bring in more of the anime crowd.
"Independence Day, Part 1" features Robin, Kid Flash, Aqualad and Speedy on their first visit to the Hall of Justice (haven't seen THAT in years).
Batman, Green Arrow, Flash, Aquaman, Martian Manhunter, and Red Tornado appear for a while before leaving to handle an emergency. The younger heroes (sans Speedy, who left after throwing some attitude) decide to take on a mission that the League had to pass up for the more immediate threat and discovers a secret about Project Cadmus.
With appearances by Mr. Freeze, Captain Cold, Icicle Jr, Guardian, Superman and Zatara.
The original trailer:
Spoiler: It also features the introduction of Superboy, who from the ads will become a member. This Superboy appears to be of the Conner variety but no word yet if he has both Superman and Luthor's genes or just Supes. From what is shown so far, one would assume that Luthor is left out of the equation for simplicity of the story.
I find it interesting that while the Aqualad is the new Brightest Day one, they're using Dick Grayson as Robin (and appears younger than all the others- 13 according to the website) and Wally West as Kid-Flash (age 15). Aqualad's identity is revealed as Kaldur' Ahm and is listed to be 16. For more information, including details about Miss Martian and Superboy, go to the website.
DC Comics is also releasing a comic series based on the show. This title will be self contained and have no bearing on any other comics.
**Upcoming episodes (on Cartoon Network)**
"Independence Day, Part 2" -Jan 16th 8PM Central
"Welcome to Happy Harbor"" -Jan 21st 7PM Central, Jan. 23rd 8PM Central
"Drop Zone" -Jan 28th 7PM Central