You've piqued my interest. .RW2 has been around for quite awhile. I'm probably stating the obvious.......but even with a fix, which will have to come from Lightroom it likely won't be available for any version older than the current one. I don't use Lightroom so I don't know where they are at.
I did see where you can get Adobe DNG converter and maybe transfer your .RW2 to DNG and then import the DNG file into Lightroom.
Yeah, PITA. One would think a manufacturer would submit new camera's to Lightroom and Photoshop before release so the software is already ready. This camera should take some pretty amazing photos once you get it sorted.
There may be better answers out there than mine.