Lucasfilm is definitely not involved with the animated Tales of the New Republic. Quite to the contrary, Lucas appears to be somewhat putting the kabosh on it, perhaps to keep people from confusing it with the upcoming 3rd season of Star Wars: Clone Wars. Clone Wars debuts in 2008, and will concern events between Episode II and Episode III:From the Wikipedia entry:
The third and last season of Star Wars: Clone Wars gives the audience a look at Obi-Wan Kenobi and Anakin Skywalker's adventures in the Outer-Rim Terrortories as mentioned in Star Wars Episode III: Revenge of the Sith. Anakin is knighted into a Jedi Knight and Coruscant comes under attack by the Confederacy of Independent Systems, as a diversion for General Grevious to sneak in and capture Chancellor Palpatine.

It's easy to see why Lucasfilm would want to squelch interest in Tales of the New Republic. For one thing, with the animators of Clone Wars transforming it it into a 3D, CGI-style for the 3rd season, its look is similar to that of Tales of the New Republic. Here is the teaser trailer:












