Another six days have gone by, and thus another pre-release beta of the forthcoming 10.8.4 Mountain Lion has been seeded to developers for testing. The new build, 12E40, again lists no new changes or known issues, and asks developers to focus on the same areas as before: graphics, Safari and Wi-Fi performance. While not mentioned in the notes, the upcoming update adds support for the emerging 802.11ac wireless protocol.
