Artifact is a brand new game by Valve based on their most successful title, Dota 2. The game plays a very important role in expanding the lore of Dota 2 and we could expect some new heroes introduced in Artifact like Rix, Kanna and Sorla Khan ported to Dota 2 as well.
Source: N4G PC Dota 2 Artifact New Card Names And A Decktracker Leaked by Beta Tester