Sorry, english is not my native language, so here is MY translation of release notes:
- Enhance reliability during boot and wakeup when USB or Thunderbolt devices are connected.
- Correction of a rare memory problem that could result in random reboots.
- Correction in integrated screen sleep feature when an external screen is plugged and Windows is running under bootcamp.
I would recommend being careful with this update. My new 2014 Air would not boot after the upgrade. I ended up needing to wipe the disk and restoring from Time Machine to get back to where I was. Hopefully the update was worth it "-)
Hopefully it fixes my issue of my connected Thunderbolt Display waking to a black screen and the only remedy is disconnecting the TB cable, open the lid, wake the MBA, then reconnect the TB cable.