You can now test it for .com and .net. Afilias also has a pilot for .info.
Kevin Murphy over at DomainIncite sub-headed earlier today that “Verisign and Afilias have become the first two gTLD registries to start publicly testing a replacement for Whois.”
Read Kevin’s article here.
As mentioned by Kevin, the output is in JSON format on the Verisign pilot. So you may want to install a JSON formatter browser extension in order to make sense of the presented data.
He reports the Afilias pilot is similar but does not currently have a friendly web interface.
I agree with Kevin. I think its fairly safe to say that RDAP is going to replace Whois soon.