What has been new with Cortana from a few weeks?

An absolutely brilliant AI Cortana has been getting frequent updates from the backend because Microsoft can do so, without updating the OS. One of the most general improvements seen in Cortana from it's initial launch is that it sounds more "Human" than before. It has got more natural tones and responses.

Cortana's impressions are really cool. Ask Cortana "Do an impression" and it will give some really amazing responses. The new animated icons make it better. Or just ask, "How's clippy?" and you will get some news about our long lost Office assistant Clippy.