LR 4.4 RC
http://labs.adobe.com/technologies/lightroom4-4/

Lightroom 4.4 Release Candidate includes a correction to the demosaic algorithms for Fujifilm cameras with the X-Trans sensor. This specifically impacts the following cameras:
Fujifilm X-Pro1
Fujifilm X-E1
Fujifilm X100S
Fujifilm X20

New Camera Support:
Canon EOS 1D C
Casio Exilim EX-ZR700
Fujifilm X100s
Fujifilm X20
Hasselblad Lunar
Leica M
Nikon 1 J3
Nikon 1 S1
Pentax MX-1

Fixed Issues:
The crop overlay tool resized incorrectly when used in conjunction with the “Constrain to Crop” checkbox in the Lens Correction panel
Background graphics were not correctly rendered within the Book Module
The supplied lens profile for the Sony RX-1 did not contain vignette information
Previews of photos in portrait orientation were blurry when viewed in the filmstrip in the Develop module. (Mac only)
Stack badges displayed the wrong count when creating new stack that included a preexisting stack.
The Filter scrollbar within the Library module was not rendering properly.


When will the Lightroom 4.4 release candidate expire?
5/31/2013