You can now use 3 of Coins in Crucible as well as the new Sparrow Racing League

There are a ton of changes that came with Destiny's newest update. One notable change will make a lot of PvP players happy. Xur's 3 of Coins will now work in any Crucible playlist, as well as the Sparrow Racing League apparently.

The latter makes sense considering I was able to complete a Crucible bounty while racing in the SRL. It doesn't matter how well, or how bad you do. The only prerequisite is to actually finish a match. An exotic might be awarded on match completion, which means if you rage quit, you forfeit the possible exotic as well.