There's now a Happening Now section, which lists trending tweets, and you can also manage multiple accounts using the app. Following the update, Twitter released version 4.1.1, which mainly focuses on bug fixes.
The update to 4.1 is yet to roll out for Windows 10 Mobile, with the latest version we're able to download still at 188.8.131.52. We'll let you know as soon as the new update is available for your phone. Until then, check out the new features in action in our hands-on video: