You can also follow this guy on twitter to see when he will make more. I don't know if this is compatible wth the firmware linked further up but it does have solder pads to enable rtc/cts. It's the same one I have but I use mine for the TI-99/4a. I'm currently awaiting my SDNet adaptor to arrive so the wifi232 is less important on Amiga at the moment, for me anyway.
http://biosrhythm.com/?page_id=1453
However, this is all great information so thanks for asking/answering, sharing and this topic. good stuff here for anyone interested.