Recently in July 2020, Alexa organized virtual developer conference Alexa Live 2020. They have introduced 31 new exciting features to make Alexa Experiences more natural and immersive. Features like Alexa Conversations (Beta), ASR Evaluation, Multi-Value Slots, Alexa Entities, Person Profile, APL for Audio, Skill Resumption, Alexa for Apps and many more.
For more details about all these exiting features please visit: https://developer.amazon.com/en-US/blogs/alexa/alexa-skills-kit/2020/07/31-new-features-to-unlock-more-natural-and-immersive-alexa-experiences
You can also check Alexa Live Release Roundup: https://developer.amazon.com/en-US/alexa/alexa-live/release-roundup