Google will hold I/O conference from May 17 to May 19, we all speculate that Android O or Android8.0 is going to be released at that time, or Google may release Google Pixel 2 smartphone. However, 9to5Google has leaked some features of Android O 8.0 OS. So are you expected them?
For example, the notification will have some changes, a new picture-in-picture (PIP) mode, a bunch of icon tweaks, and smart text selection toolbar supported by Google Assistant, apps on the background has been limited, streaming media recording in API optimization, the business level features update, etc. The superscript, dynamic icon, floating toolbar are similar to IOS, most have been supported from Chinese third-party ROM.
As for notification bar, almost every generation android OS will be adjusted, the reason to restrict background apps are relative to battery life and storage occupation, PIP and streaming media recording are the advantages for large screen watching and games playing.