Apple just released fourth beta of iOS 11 to developers

Apple pushes iOS 11 beta 4 for registered developers today. The
iOS 11 beta 4 is available for iPhone, iPad and iPod Touch.
Apple has added many useful features to iOS 11 such as
redesigned control center, redesigned multitasking on iPad, drag and drop
feature and many more. The iOS 11 beta 4 does not have any new features but
comes with plenty of bug fixed and stability improvements.
The iOS 11 beta 4 is currently available for registered developer
only. The registered developer can install this beta from the developer account
or can directly update via OTA if they have already installed previous beta.