Interesting that they use an sql-like query in the examples.

I hope this does not mean that this will be taken as the default method of querying.. A JSON query object could've been nice as an example.

How should you handle conflicting parameters (form-encoded + body)?

Also, on the HTML side.. If it's extended to <form method=QUERY>.. how will you be able to distinguish between the query part and the uri part?

How can/should you copy/share links? Will browsers simply base64 encode this somewhere?