What's newAdobe Photoshop Lightroom 4 is available on the Mac App Store for $149.99. [Direct Link]
• HiDPI support within the Library and Develop Modules. HiDPI provides support for Retina-enabled Macs.
• Additional raw file support for 20 cameras including the Canon EOS 6D, Nikon D600 and Olympus PEN E-PL5
• Corrections and bug fixes for issues introduced in previous versions of Lightroom.
Apple's annual developer conference in San Francisco.