Using JSON or XMLRPC instead of RSS

Is there any chance, moving forward, that this would use JSON or XMLRPC for importing blog posts from another WordPress site?

I'd like it to import the username and any post-meta data for literally cloning posts from one site to another.

Basically, I have a radio station site for one city and a radio station site for another city. I'd like to clone posts that are common between the two cities (national news, celebrity news, etc..).

The problem is that using RSS, I have to create multiple import points to keep user names the same. And, I have custom-fields in the posts that aren't copied.