The Gallery Widget
WordPress 4.8 version has some good media widgets with image, video, vimeo and audio etc. Now WordPress allows users to add a gallery in their widget areas too. Now user can easily add gallery in widget see below screenshot. it is easy to change also.
Short-codes in Text Widget
user can now embed videos from any wordpress site which supports oEmbed. You can also embed your Facebook Live stream, video stream etc.it is to change and add in widget for user. see below screenshot .
Media in Text Widget
WordPress 4.9 will also allow to user embed media in the text widget. it is a media specific widget user can alignment his content with media see below screenshot.