Amazon is set to hold an event today in New York City, where it's expected to unveil an update on its Alexa digital assistant. The company has been working to come out with a new version of the assistant with more advanced AI capabilities. A new flagship Echo speaker is also expected to be unveiled and new Fire TV features. Amazon has lost billions of dollars on Alexa and its devices business since it launched in 2014. Amazon may opt to charge for Alexa.