They didn't just add it, it has been a feature for a while. I think it was last year when CS5 first came out, long before any mention of FCPX. They did just
improve it with an update, maybe that's what you meant.
http://blogs.adobe.com/premiereprot...vements-in-final-cut-pro-xml-interchange.html
At least there's an option out there for people looking to migrate from FCP7 to a 64-bit editor that works with past projects.