Pulled into my Reston town center parking garage this morning directly behind another black JCW hatch (what are the chances?!). This one looked to be a slightly newer 2011/2012 with the CR roof / bonnet stripes, but otherwise nearly the twin of mine.
They peeled off the other direction and I was late for a meeting so couldn't track them down but was a great start to the morning!
Also, the tag was some seven letter derivation of "MINI Ninja" I believe, if it was you.