I wrote this to test several social hypothesizes I had as well as test some new tech and raise some money at the same time. I'll write up a full analysis after the contest is over.
After reading this: http://antimatter15.com/wp/2011/01/the-ambiguity-of-open-and...
It sounds like the plugins with be in the OS and not the browser. So it will be like downloading a codec for your Mac or PC not like installing Flash on in your browser.
The big distinction here is that it will be native to the browser because IE and safari use whatever codecs are in the OS instead of providing their own.