Changes in Adobe Photoshop Lightroom 4.3 RC1:
Features:
* Support for HiDPI displays within the Develop module.
The following new cameras are now supported:
* Canon PowerShot S110
* Canon PowerShot G15
* Canon PowerShot SX50 HS
* Casio Exilim EX-ZR1000
* Casio Exilim EX-FC300S
* Nikon D600*
* Olympus PEN E-PL5
* Olympus PEN E-PM2
* Olympus STYLUS XZ-2 iHS
* Panasonic DMC-GH3
* Pentax K-5 II
* Pentax K-5 IIs
* Pentax Q10
Fixed Issues:
* Unable to upload a large panorama to Adobe Revel via the Revel Publish Plugin
* Unable to add a second photo to a page layout in a Book. This only occurred when the “Show Unused Photos” filter is selected in the filmstrip.
* A photo can be flagged as both a “Pick” and “Reject” at the same time when using the Toolbar to apply flags
* Using multiple fonts within the same text cell inside a Book can sometimes cause Lightroom to crash
* Exposure becomes the active adjustment slider in the Basic panel (within Develop) when moving from image to image
* Customers using Photoshop Elements 11 were unable to upgrade their catalogs in Lightroom 4
* Custom Cell padding options in the Book Module reset in between Lightroom sessions
* 1080p video files shot on iPhone 4S flicker on replay
* Leaving the Book Module after using multiple text colors in the same text cell can sometimes cause the book to be lost. 

System requirements Windows

* Intel® Pentium® 4 or AMD Athlon® 64 processor
* Microsoft® Windows Vista® with Service Pack 2 or Windows® 7 with Service Pack 1, Windows 8
* 2GB of RAM
* 1GB of available hard-disk space
* 1024x768 display
* DVD-ROM drive

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Homepage : http://www.adobe.com/products/photoshoplightroom/