Someone with a scope or perhaps a frequency counter should be able to answer this; unfortunately I have neither on hand right now.

Is the I2S data stream available on the 'I2S' header in a 16 or 32 bit format? eg, is the bit clock 1.4112 or 2.8224 MHz?

The I2S header pinout was posted in this thread, for reference...
http://empegbbs.com/ubbthreads/showflat.php/Cat/0/Number/54992/Main/52239

Thanks!