According to people familiar with build 12F36, the Mountain Lion seed comes with no known issues and asks developers to focus on many of the same areas as previous releases.
Two new areas of interest were added to the usual graphics, Wi-Fi and wake from sleep functionality. With build 12F36, Apple requests testing of PDF viewing and accessibility and mobile device management.
The latest seed comes one day after the release of OS X 10.9 Mavericks Develooper Preview 7, and nearly one month after the last Mountain Lion beta was issued.
Apple is expected to release both the Mountain Lion maintenance update and next-generation Mavericks later this year.