Olympus has released its E-5 camera, which has a weaker anti-aliasing filter, and uses the in-camera processing chip to (apparently) address moire problems that may result, as well as "Fine Detail Processing technology, utilizing a sophisticated algorithm to deliver all the information from eachimprove image quality" -- at least in JPEG output.
To put it plain and simple, Aliasing cannot be undone after is has been recorded. Aliasing artifacts are larger than the finest detail that the sensor can
reliably resolve (Nyquist limit) and are blended in with real
lower resolution detail. No way the two can be separated after the fact (unless there is prior knowledge what is recorded where and at which magnification). What can
be done, is reducing the visibility of some of the aliasing artifacts, but with it comes a loss of real detail that was resolved accurately. For some structures that will be hard to see, for others it will be a net loss.
As other have answered before me, what actually gets recorded in Raw is not disclosed.