While the TCW episode guides may be different these days, SW.com is still labeling them as such so we will too. The guide for "Prisoners" (S4 Ep.3) has now been posted at the renovated main site and includes the following synopsis:
"The Republic and Gungan forces have been captured by Riff Tamson and his Karkarodon enforcers. Now, it is up to Ahsoka and the young Prince Lee-Char to unite the fractured people of Mon Cala and drive out the Separatist invaders."
Click here to view the full guide. Since they are now layed out a bit differently, we'll briefly break down what you can expect. The Video/Images tab provides a couple screenshots, some concept art, and a trailer for the episode. The About tab gives you the synopsis, the episode opening liner, and links to more info.
Keep checking back to TFN for the full episode preview from Lucasfilm just as soon as they release it.