Seems Microsoft is updating Cortana in background now. Interests are currently not available for Cortana and the message says,

Go ahead and tell Cortana what to do, interests are not available at the moment.

One of our readers Ketu tells us that he was able to find out some changes in Cortana today. She seemed more knowledgeable and can handle stocks related stuff with ease. Some new graphics are also visible on Live Tile.

Check and do tell us, if you find anything new.