Apple announced the next iteration of OS X yesterday – El Capitan. Along with a few minor features that look promising (split view, tab muting in Safari), Apple is touting improvements in graphics rendering that could lead to performance boosts in Adobe Creative Cloud apps like Premiere Pro.
Adobe claims their own tests showed an 8x improvement in After Effects rendering.
The update will be released this fall, but early adopters can volunteer as beta testers at apple.com.
Official El Capitan Page at Apple.com (Scroll to the bottom for Beta program signup.)