Tesla P85D 0 to 60mph acceleration will improve by ~0.1 sec soon via over-the-air software update to inverter algorithm— Elon Musk (@elonmusk) January 29, 2015
It's basically unprecedented for a car's stats to meaningfully improve with an over-the-air update just like the one you get on your phone. Most manufacturers don't yet support comprehensive firmware updates over a cellular connection, but Tesla's been doing it with the Model S for quite some time — it's a lot easier than dragging it into a dealership, obviously. A software update for your Galaxy or iPhone that improves performance is one thing, but a software update that lets you smoke more fools on the drag strip is quite another.
As a refresher, here's our own Josh Lowensohn getting a hellride in the passenger seat of a P85D late last year: