A thread over on diyAudio forums discusses another Class D chip manufactured by Freescale Semiconductor. The first posting includes this link to their white paper (I've also added it to our 'Articles' section).
One of the posters speculates that Freescale will be partnering with Apple to produce a multichannel preamp/amp combo. Seems unlikely to me, but... you never know. There are so many Apple rumours flying around that it has all become just a bit of noise.