From the update:
In addition to Darkness Unleashed, we're going to be releasing another new set this summer - the Ascension Apprentice Edition. Unlike Darkness Unleashed, though, Apprentice Edition is aimed at newer players - it's a 110-card set built to be an introductory experience for two players. We wanted to offer a way for players to try out Ascension at a cheaper entry point than usual sets, so we're offering the new Apprentice Edition for only $9.99.