The Law & Order episodes just keep coming (on iOS at least). Episode 5: Ear Witness is now available to purchase through the Law & Order: Legacies Universal App (which is still offered for free at the time of this writing). The way the app works is that the first game comes with it, and the remaining episodes are available to purchase per episode or in a bundle for US$12.99. Bundle purchasers on iPhone, iPod Touch, or iPad will be able to play the first 5 episodes. The remaining two episodes will be released at a later, as-of-yet-unannounced date.
There's no word yet on when episodes 4 and 5 will be released on PC and Mac, but the first three episodes for PC/Mac are available in a bundle for US$19.99 from the Telltale store.