Plugged the device in for the first time last night and sound came out... so far so good... 
I'm trying to investigate playing with the GPIO on WM5102 on the sound card but I'm having trouble doing register writes using the SPI interface. It looks (from the debug scripts provided in the kernel image) that the audio card is using spi0,1 but when I look at "ls /dev/spidev*" it only lists spidev0.0. Trying to do a transfer of bytes to this address just returns zeros.
This is practically a clean load of the 3.10 image I downloaded from element14 and I'm following the SPI example given on Simple SPI on Raspberry Pi - 100RandomTasks
Is there something I'm missing? It looks like the I2C is used only for the WM8804 and the SPI used to control the WM5102.