Interesting, thanks! Perhaps someone can weigh in and report if it's actually true...
Here's a not-too particularly helpful link:
DPP v3.11 includes a new Digital Lens Optimizer (DLO) tool that is designed to improve image resolution. DLO imitates lens performance, with a series of mathematical functions replicating each stage of the journey of light through the optical path. Using this information DLO can correct a range of typical optical aberrations and loss of resolution caused by a camera’s low pass filter, by applying an inverse function to each shot to take the image nearer to how the scene appears to the naked eye. This creates detailed, high-quality images with manageable file sizes, providing photographers with maximum image quality and greater flexibility.
Maybe they do indeed say "this lens causes this to happen at this pixel, so if we adjust the reading at that pixel by this amount, it will correct it" and actually re-write the RAW. They could also embed the original untouched raw for archival purposes (which would directly double file size).
From the CW interview, it isn't limited to 5D3. Anyone with a camera from the 30D on up should be able to try it out. I think I'll install DPP 3.11 when I get home and see if it outputs raw or raw-like files (i.e. not bitmaps).