What are you opening the raw files in? I just shot in that mode, imported to Lightroom, and during the import they showed as 3:2 but in Lightoom displayed at 16:9. I went to the Develop module and clicked on the Crop tool and it showed that it had applied a 16:9 crop factor but the entire image was there.
If you've got a bunch in there select them all, go to the Develop module, change the crop on the one displayed from "As Shot" to "Original", and then click on Sync and just check the Crop box.