I emailed EJ and asked him directly if they W4S will be modding existing transports to have a I2S/HDMI output and here is what he said:
I'm very sorry for the delay in my response, I've been terribly busy lately.
Yes, we will be offering modifications to work with our I2S input on the DAC-2. We don't have the circuit finished as of yet, or a list of transports, but given that we can find the internal I2S from the optical drive, there shouldn't be an issue.
Sounds good, but I guess it might be a good idea to wait for a list of transports from W4S instead of hoping that they will modify any transport.