Fantastic article! It is about the ambition of Facebook. The social networking site has a desire to be a major part of the fabric of the web... a broker of web information in a way similar to, if not beyond, Google.
A Couple Implications on Art:
Most obviously, the simple action (they say it's simple) of adding the ability for viewers to "Like" your artwork. This is a plugin that you can add to your site so people who appreciate your art and have a facebook account can "Like" it and broadcast its existence to their entire friend network. This could work wonders for promoting your work.
Further... the introduction of a new and more accessible API will give plenty of exciting options to New Media artists.
UPDATE: Watch F8 Keynote speech here: http://apps.facebook.com/feightlive/