Apple releases the second beta of iOS 10.3.3 (build 14G5037b), macOS 10.12.6 (Build 16G12b), watchOS 3.2.3 (Build 14V5734a) and tvOS 10.2.2 (Build 14W5735a) and can be downloaded from registered developers. The public beta versions of iOS and macOS are expected to follow shortly.
Registered developers now have the option to load and install them on their iOS devices. The easiest way to install is to use the “over the air” update directly on the iPhone, iPad or iPod touch. Since it is an iOS 10.x.x update, you should not expect too big changes. Apple will primarily work under the hood, eliminate bugs and accelerate and stabilize the system. A change has been shown in iOS 10.3.3 Beta 1. Apple provides new background images for the 12.9 inch iPad Pro.
In less than a week, we expect the start of the big beta phase around iOS 11 and macOS 10.13. These updates are very likely to be presented as part of WWDC 2017. A public beta of these updates will presumably be launched in the course of the summer, before the final version will be released for all users in Fall.