New RPi B+ has changed I2S pins and needs other pinmux. Just with four jumper wires - it does not work (and not yet with latest distro, June 2012):
It needs a Linux Kernel Patch.
I did (just change three bytes in a kernel module, driver) - it works:
Raspberry Pi B+ and RPi-DAC
Without kernel patch and trying to use I2S - the RPi B+ will hang (conflicts on GPIO pins).
With the kernel patch I did - all I2S DACs, also RPi-DAC-RCA (HifiBerry alternative) will work which do not need I2C control (Wolfson will not work). For those - please wait for the updated Rasbian Linux distro.
