Pinball Arcade has reached a lot of platforms, but its absence from Xbox Live Arcade is explained in the FAQ on the game's site, noting that unavailability on the platform stems from "legal problems with Microsoft and [publisher] Crave and we must wait for legal resolution while we consider other options." A forum post from January, spotted by Polygon, notes FarSight's plans to "re-launch" Pinball Arcade on XBLA. This post also shares a Linux version on Steam in 2014 as well as plans to submit a Wii U version to Nintendo in early 2014.
FarSight shared hopes to continue expanding Pinball Arcade's lineup for as long as sales "stay strong!" Hopefully the renewed license doesn't make FarSight think they're the Bally king; that crown's already been claimed.