None of the titles are available for download—they're streaming rental only—but the good news is they're all available to watch on PC, Mac, Linux, SteamOS, and SteamVR, so you have plenty of options.
Lionsgate says the number of available movies will grow as "the partnership continues to expand worldwide." Available titles include The Hunger Games, Twilight, Saw, and Divergent.If you're big into blockbuster franchises, you have a whole lot of watching to get to.
H/T the Verge