I'm sure they meant lossless compression...
The a900 has the option for both, so they have already done the work to achieve this in previous cameras. Seems like it would be nice to bring it back for the cases where it is beneficial.
I, for one, would shoot in lossless for all of my work because contrast and exposure adjustments for B&W images (in particular if you are employing color filtration impacts) can be far greater than you would ever do in color, and all kinds of noise artifacts, color (levels) clipping, and compression becomes much more apparent.
Hell, let's just go to 16-bit and be done with it while we're at it! Hahaha... It will happen eventually...
---Michael