“We’ve been looking at our metrics which suggest that the vast majority of new and regular Arena players tend to play Arena through the main Elite Dangerous client rather than the standalone Arena one,” Senior Community Manager Edward Lewis explained to fans. “We’ve made the decision to remove the standalone version of Elite Dangerous: Arena in order to reduce the number of builds that have to be maintained and managed across Steam, Xbox One and in 2Q’17 PlayStation Network, as well as clarifying the choices for new players of Elite Dangerous on these storefronts.”
Arena has been a standalone product for only a year and ran $7.50 in that mode. Apparently, it was no longer worth it to maintain in that format, although of course it can still be played as part of the original game. As RPS points out, we can probably assume Arena will never launch on PlayStation either.
Frontier continues to sell three digital download versions of the game running from $29.99 to $59.99.