There are three flavors of DNG.
1. Standard DNG, not lossy, smaller than CR2, you cannot convert back to a cr2 format, but can convert to tiff.
2. DNG with CR2 embeded. Not lossy, very large file, and the CR2 can be extracted, and a tiff file can be extracted.
3. Compact DNG, Lossy but better than jpg, CR2 cannot be extracted, but tiff can.
The advantage of DNG files in Lightroom, at least, is that they load much faster and do not take nearly as much time to generate the image. LR4 can take a while to generate images. The standard DNGS save disk storage space, and the compact version saves a lot of disk space. If you want to use expensive SSD storage, that might be a big benefit for now, anyway.
There is a wide selection of editing software that can use DNG files, so you may not have to wait until raw converters are available to use your favorite software.