Updated 01/25/18: Apple has released Beta 2 to developers. The big addition is the Battery health feature on some iPhone models.
Hot on the heels of iOS 11.2.5, which brought HomePod support, Siri news, and a fix for the Messages text bomb, Apple has started to release betas of iOS 11.3. And it’s going to have some pretty cool features on board, including the one we’ve all been waiting for: a toggle for CPU throttling on phones old batteries.