Amazon rolled out an automatic upgrade to its Alexa virtual assistant. Alexa+ has new voices and new features.

Amazon is hosting a devices launch event on Tuesday, where it's expected to unveil new hardware. The event, which could showcase the latest in Alexa+, Echo and Kindle, is slated to kick off at 10 a.m.

Amazon recently launched Alexa Plus, a major AI-powered upgrade to its voice assistant. This new version brings significantly ...