Apple undoubtedly has a lot on its plate these days. From a developer's point of view, the new programming language, Swift, is intriguing. The new Metal API for efficient access of GPU features looks promising. SceneKit, SpriteKit, and other frameworks continue to grow and improve.
It's too bad the bread and butter for OS X and iOS developers, Xcode, has become increasingly unstable to the point of uselessness in version 6.1. There is a 6.1.1 available in theory. Sadly, Apple's on-line resources for developers including updates for Xcode are routinely unavailable (OK, unavailable from December 20 to the time of this writing) and ridiculously slow when available.
I started writing this with the intention of enumerating the frustrating productivity encumbrances introduced in Xcode over the last several versions like dialogs that steal focus and obscure the app being tested or refactor operations that take 30 minutes on a fast machine for in a project containing 4 files, but I suddenly lack the will. I'll just leave you with two gems:
0x7fff97440132: jae 0x7fff9744013c ; __psynch_cvwait + 20
"note: please rebuild precompiled header"