Maybe I am just not getting it, maybe I am in my sceptic mood or maybe I am getting sensationalist news fatigue. It's an iPad app yes, so what? Where someone expecting that FB wouldn't do an iPad app? Why is it secret? Does it do anything remarkable? It seems like this is news because it's FaceBook not because the app in itself is interesting.
Mark Zuckerberg mentioned several times how an iPad app would be wrong, because its not really mobile or something like that and it came so incredibly late. The second most visited site, over thousand employees and a iPad app is such a big problem. Hackathons, lockdowns, expensive Ex-Googlers, new campus and i am again totally unimpressed.
Also, IMHO touch.facebook.com and running the iPhone app on the iPad are both shitty experiences (the iPhone app less so but the low res on images and keyboard are pretty painful).