I noticed this was raised at howtogeek
The idea is that if you simply have a naked link in the middle of a sentence, like this http://meta.discourse.org/ we perform a certain “onebox” action. At the most rudimentary level it could grab the title of a page and use it as the name, but it could get fancier. We could also inject a tooltip with extra info or format the link name with more interesting rules.
The one caveat is that it makes it more complicated to post bare links cause you would need to do something like