This page outlines the status of high-level feature areas to bring from Apple's Java SE 6 to the macosx-portMac OS X port of JDK 7u4. 7u4 is in its final ramp-down, so don't expect a lot of changes here.
A list of popular open issues is available at the JIRA bug reporter.
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Build 
build using clang- build .jdk bundle (for CommandLine and embedded use only)
- build embeddable .jre bundle
- HotSpot
- Load Load .jnilib (in addition to .dylib) temporarily lost this; hopefully it will be restored soon
- remove ALWAYS_PASS_TEST_GAMMA hack
- register new threads as ObjC-GC capable
- DTrace v2-style probes
- Core Libraries
- Precomposed/Decomposed File path translation
- NIO
- kqueue based Selectors
WatchService implementation
Async I/O API
- Proxy Server handling
- Locale support
- System properties fixup (vendor name, etc)
- Resolve "Darwin" vs. "Mac OS X" checks
- JNI interface
- Networking
- X11
- Universal binaries
- JObjC
- get tests passing
- self-generate BridgeSupport full files
- Cocoa AWT
- 2D drawing (OpenGL based)
- Cocoa key/text events
- cleanup to use JRSEvent API
- merge JDK6 CWindow -> LWCWindow changes and style flags
- update CImage
- Transparent window support
- Headless
- remove $AWT_TOOLKIT=CToolkit, switch to default
- threading cleanup
- Aqua LaF
- Requires an image tile cache
- Screen Menu Bar
- Needs cleanup to use JRSMenu API
- Needs refresh from Apple trunk
- Fonts/Text drawing
- Needs cleanup to use JRSFont API
- Accessibility
- Clipboard
- Drag & Drop
- InputMethod support
- AppleScript javax.script engine
- Sound
- Printing
- Keychain Provider
- JAWT (for SWT/3D embedding)
- Smartcard
- Fix Kerberos code to read config info from SCDynamicStore (needed on Lion) | http://java.net/jira/browse/MACOSX_PORT-566]
- AWT Desktop API
- System Tray
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