Some of our readers tipped us about it and you may certainly like to give it a try. Cortana seems different since yesterday. The interaction with Cortana sounds more natural than ever. The voice, the replies etc are much more human. So, seems Microsoft has updated Cortana’s engine in background.
You can try asking questions which engage Cortana in conversation and let us know what you think?
For getting Cortana you need to have Windows Phone 8.1 on your device by using dev preview app on your device and if you are outside US, you may need to do a trick to get Cortana on your device.