This is a welcome development on the standardization of the .pdf document format. PDFs have been the proprietary format of Adobe but a year ago Adobe finally released PDF's for international open access and standardization. The format has just been formalized as such. Let Adobe's process be a shining example over against the Mob-like manner in which Microsoft got its new OOXML format accepted into ISO.
I have previously touted the great capabilities Preview.app has for working with PDF's, and these tools will only improve with the PDF format becoming open.
One other PDF note is that Adobe has just released version 9 which I still can't imagine using in place of Preview.app. It does have the added feature of displaying embedded Flash which would be as useful to me as shoving bamboo shoots under my fingernails.