Here's the Scoop:
According to an article post on www.rollingstone.com by Erin Coulehan (and backed by Lady Gaga's website), ARTPOP will officially launch on November 11, 2013 in two volumes. Lady Gaga's first single from ARTPOP will be released on August 19, 2013 and pre-orders for the album will start on September 1, 2013 (an app accompanying the album will also be available on the same day as pre-orders).
German DJ-producer Zedd has collaborated on about five or six songs with Gaga for ARTPOP. "There's obviously more ideas and half-finished songs, but I'm not sure what she will want to put on the album," Zedd tells Rolling Stone. "I just really can't imagine they would not like it, to just say it straight up." Here's his opinion about the work they've created together, "I think the stuff we've made is pretty f-cking cool."